Tech Startups Germany · 2025-07-24 · 26 min
Key moments - from our scoring
Substance score
52 / 100
Five dimensions, 20 points each
Voltfang transforms end-of-life electric vehicle batteries into stationary energy storage systems for commercial and industrial use. Founded by David Odansia, Afshin, and Roman - three RWTH Aachen engineering students who initially bought a camper van and needed a better battery solution - the company has evolved from a home storage play into a critical infrastructure player. The startup secured €15M in funding and operates Europe's largest second-life battery factory, with deployment partners including Stuttgart Airport and grid operators across the continent. The core insight: used EV batteries retain 70-80% capacity and represent a massive untapped resource for decentralizing energy storage and grid stabilization. Voltfang's technology reduces both CO2 emissions and energy dependency while creating circular economy value. The founders initially tried the consumer home storage route before pivoting hard to commercial-industrial, realizing the real market opportunity lay in utility-scale and business applications. Key lessons emerged around focus - the engineer's trap of building everything in-house rather than specializing - and the irreplaceable value of co-founder trust during funding droughts and pilot failures.
Second-life EV batteries are used electric car batteries that retain 70-80% capacity after automotive retirement. Voltfang deploys them in utility-scale stationary storage to stabilize grids, absorb renewable intermittency, and provide peak shaving - functions traditionally filled by coal plants, but without emissions and with circular economy benefits.
Home storage proved slow to scale with high customer acquisition costs and fragmented demand. Commercial and industrial customers - like Stuttgart Airport and grid operators - had larger, standardized needs and faster decision cycles, enabling much faster revenue growth and unit economics.
David, Afshin, and Roman maintained trust, lived together, and operated with a 'how can I help' mindset rather than blame. They committed to trying for 1-2 years with the logic that energy storage was inevitable, and kept each other's backs through funding droughts and dropped deals.
The founders believed they needed to build every component in-house - battery management systems, energy management software, certifications - copying Tesla's approach. They eventually learned to focus on their core differentiation and partner on commodity layers, dramatically improving speed to market.
By distributing used EV batteries across industrial sites, commercial facilities, and grid nodes, Voltfang reduces dependence on centralized coal or fossil fuel plants and enables renewable integration at the edge, improving both resilience and decarbonization across Europe.
Our reviewer’s read on each dimension, with quotes from the episode.
The episode contains some useful founder insights about pivoting from residential to commercial/industrial storage and the importance of focus, but much of the content is soft biographical narrative (camper van story, co-founder dynamics, personal toll) that doesn't yield dense operational takeaways. A B2B operator would gain modest value from the 'trying to do everything' lesson and customer insight about energy consumption awareness, but these are not novel observations.
we started as a residual storage provider. So for the home storage we figured out that's not the best way to grow. Therefore we decided to pivot into commercial industrial
we wanted to do everything on the horizontal to actually on the tech side because we thought, okay, Tesla can do it, why shouldn't we do it?
The core narrative - engineering founders starting with a side project, learning to focus, pivoting from B2C to B2B2C - is a well-worn startup playbook. The second-life battery angle itself is not original; this space has multiple players. The guest offers no contrarian frameworks, first-principles thinking, or counterintuitive claims that would distinguish this from typical founder interviews.
when you are at the RWTH and you are not the smartest person on earth, you will be average or below average
you need to focus, you need to focus, focus. And again, you need to focus to be able to grow fast
David is a legitimate operator - CEO and co-founder of a company that raised €15M, built Europe's largest second-life battery factory, and secured real customer deployments (Stuttgart Airport, grid operators). He has domain experience in cleantech and hardware. However, he is not a household name in venture/startup circles, and the episode doesn't establish whether he's an exceptional or merely competent founder at his stage.
David Usanti is the CEO and co founder of Voltfang, a German climate tech startup that transforms used electric car batteries
company that just raised 15 million euros, opened the continent's largest second life battery factory and secured projects with partners like Stuttgart Airport and grid operators
The episode cites some concrete anchors: €15M raise, Stuttgart Airport and grid operator partnerships, Weissweiler coal plant (1.6 GW capacity), RWTH Aachen education. However, most claims lack supporting detail. No metrics on unit economics, battery degradation rates, cost per kWh, customer acquisition costs, or revenue. The customer insight (energy consumption awareness gap) is mentioned but not quantified or evidenced with examples.
1.6 gigawatt. That's actually our moonshot of Voltfang getting rid of coal
we figured out that you could buy Tesla batteries just out of the Eber Kleinenzeigen
The host asks some decent open-ended questions (darkest day, misconceptions, unexpected customer insights, moonshot) that invite real reflection. However, follow-ups are often surface-level. When David admits burning money and time on unfocused development, the host doesn't push for specifics (how much? what was the opportunity cost?). The questions about team dynamics and personal toll are fluffy and don't probe business substance. The host rarely challenges or stress-tests claims.
What kept you from giving up?
what were you completely wrong about when you launched like tech readiness, market demand, or was this something else?
Computed from the transcript - who did the talking, and the words that came up most.
What if the key to Europe’s energy independence lies in the batteries of yesterday’s electric cars? This isn’t science fiction - it’s Voltfang’s reality. Today’s episode takes you inside the world of second-life EV batteries, where German climate tech startup Voltfang is repurposing used electric car batteries to stabilize power grids, decentralize energy systems, and replace coal-fired plants across Europe. With a €15M funding round and partnerships with major players like Stuttgart Airport, Voltfang is scaling from humble camper van hacks to operating Europe’s largest second-life battery factory. What You'll Learn: How second-life EV batteries can transform renewable energy storage. Why energy decentralization is critical for Europe’s climate future. The startup journey from garage project to €15M scale-up. Lessons on resilience and leadership from Voltfang’s co-founders. Common misconceptions about scaling cleantech startups. Insider insights into Germany’s and DACH’s energy transition. Guest Spotlight:David Oudsandji, CEO & Co-Founder of Voltfang, shares the story of how three friends turned a side project into one of Europe’s most ambitious clean energy startups.
Transcribed and scored by The B2B Podcast Index.
WEBVTT 1 - > Hey guys, what if the key of Europe's energy future is 2 - > sitting in the trunk of yesterday's electric car? Today on 3 - > StartupRaid IO, we're talking to David Odansia, 4 - > CEO of Voltfang, the startup that turns EV batteries 5 - > into grid stabilizing green powerhouses. We'll 6 - > ask how did a broken camper battery lead to a 7 - > 15 million US dollar raise? What's behind Europe's 8 - > biggest second life battery factory?
And how do you pitch 9 - > a vision bold enough to replace coal? 10 - > You don't want to miss this. Stay tuned. 11 - > Welcome to Startuprad IO, 12 - > your podcast and YouTube blog covering the German 13 - > startup scene with news, interviews and 14 - > live events.
15 - > David Usanti is the CEO and co founder of Voltfang, a 16 - > German climate tech startup that transforms used electric 17 - > car batteries into cutting edge stationary 18 - > energy storage systems. With a background in 19 - > industrial engineering from rvthen 20 - > R wth Aachen, David leads one 21 - > of Europe's most ambitious second life battery 22 - > initiatives. A company that just raised 15 million 23 - > euros, opened the continent's largest second 24 - > life battery factory and secured projects with 25 - > partners like Stuttgart Airport and grid operators.
26 - > WorldFunk's technology is not only reducing 27 - > CO2, but also decentralizing energy security 28 - > across Europe. David, welcome to the show. 29 - > Thanks for having me. Totally my pleasure.
We. We already made some 30 - > jokes before we started, so we both pretty relaxed. 31 - > Take us back to the camper trip that sparked 32 - > world fun. When did you realize there was a business 33 - > behind repurposing EV batteries?
And are you still 34 - > camping? I wish. I 35 - > actually wish I was still camping. It's.
It's a 36 - > long time ago when I. When we were camping the last time. 37 - > But to start the story, I'm David, co founder and CEO 38 - > of Vol. I'm originally from Cologne, so in Germany we say 39 - > Kung.
Then I moved to Aachen because of my studies 10 years 40 - > ago, roughly 11, where I also met my two co founders, 41 - > Afin and Roman. So we. We started studying 42 - > together at the rwth. And if you 43 - > are studying there, you always want to escape 44 - > when the exams, the exam phase is over.
45 - > So what we did, we bought a camper van together. And the 46 - > reason was just to get out, to get to the Netherlands, to the Belgium, 47 - > to every kind of party, festival or vacation 48 - > we could to get some freedom back. And that's what we did. 49 - > We bought a camper van, an old time of year Ducato, 50 - > which we lovely called Mia.
51 - > And with Mia we did everything. And the 52 - > problem was just that Mia is an old timer 53 - > with not such a huge motorization and the batteries 54 - > was as old as MIA. And in Germany you need to be 30 55 - > years or plus years old to be an old timer. Therefore you know 56 - > how degraded the battery was.
So our idea was to 57 - > change first of all the battery storage system inside of 58 - > it and also to integrate a solar panel on the roof. Because 59 - > if anybody, everybody wants to charge their phones, then the battery gets 60 - > empty extremely quickly. So we decided to do that. Roman 61 - > just jumped on the roof and put a solar panel 62 - > from ebay Klein inside, inside of it or on top of it.
63 - > And then the idea was, which kind of battery shall we take? And 64 - > we found out that you could buy Tesla batteries 65 - > just out of the Eber Kleinenzeigen. And 66 - > therefore we said, why shouldn't we take them? Easy 67 - > answer, way too heavy.
And the motorization is so bad we just 68 - > go downhill if we want to get up a hill. Therefore 69 - > we decided not to do that and 70 - > we bought another battery storage and then we put it 71 - > inside. Everything was fine. But a few weeks later, 72 - > Roman's father just asked him why, whether he knows where to buy 73 - > a storage system for his workshop.
So he has a 74 - > solar panel on the roof and he wants to consume as much solar 75 - > as possible. And we engineers are really 76 - > naive and we think we can do everything. Therefore Rohan just said, 77 - > we can build you one. And that's what we actually did.
78 - > We just closed the doors behind ourselves 79 - > for we anticipated three days. In the end it was two weeks 80 - > to build a storage system with these kind of Tesla modules, everything 81 - > based on open source. And after two weeks and a 82 - > lot of, no, not a lot really less sleep, 83 - > we were able to actually run the system. 84 - > And then we thought, look, we are at the end of our 85 - > studies, we don't want to just end up in a corporate, we want to do 86 - > something which matters.
And actually we want to be free also in our work. 87 - > Therefore we said, look, let's just sell it from the 88 - > neighbor to the next neighbor and maybe to five other neighbors. So that 89 - > was the idea, just to sell one by another. And we 90 - > didn't even thought about VC startup and raising 91 - > a lot of money and so on, so forth.
We just thought, maybe that's a 92 - > solid business. And after the university, when you 93 - > don't do it after university, when shall you do it then? And therefore 94 - > we started World Fund. 95 - > Interesting story.
I have to admit. Taking it 96 - > from there, what was your first major 97 - > challenge like tech regulation or team that 98 - > made you doubt that your idea may work? 99 - > So in the end we just started, 100 - > we had the tech, we had a prototype running, 101 - > we didn't have so much knowledge about batteries. Therefore the tech was one of the 102 - > biggest things, we actually didn't care about regulation so much.
We just said, 103 - > okay, they have pilot projects, we just start and try. And 104 - > therefore we didn't, we didn't think so much about regulation 105 - > and the team, since we three are friends 106 - > and long time friends, we didn't care about the team 107 - > either. And also the RWTH has a lot of 108 - > engineers who are like minded, therefore that was also not 109 - > an issue. So tech was the biggest thing and selling our storage 110 - > systems with the limited amount of capital we had 111 - > in the beginning.
So we just said, look, how could we develop 112 - > something with so much so less money? And 113 - > then we tried to sell something which we didn't even have and it 114 - > was actually really hard. And 115 - > then like after a half a year, one year, we still was 116 - > wasn't able to sell one. But that was also the time 117 - > we thought shall we do that?
Maybe it doesn't work out, and so on, 118 - > so forth. But since we started, since we said 119 - > why it should work, because it's logic 120 - > that we need something like this. If you have solar, you need to store it 121 - > somewhere either or you will put everything into 122 - > the grid and destabilize it. So we said, look, we just do it 123 - > for one, two years and if it doesn't work out, we try something 124 - > different.
But actually it worked out. 125 - > I see, so at one point 126 - > you realized it works out. I was wondering when you 127 - > were a student in Aachen, 128 - > now you're cleantech founder, helping to rewire your 129 - > script, did that also change your self image? 130 - > Totally.
To be completely honest, it 131 - > changed it totally. I in the university, 132 - > if you are at the RWTH and you are not the smartest person on earth, 133 - > you will be average or below average. And therefore I always had the 134 - > feeling of not fitting because all the others 135 - > were way better engineers. For example, Afshin, which is one of the brightest minds 136 - > I know, Roman as well.
And therefore I always had 137 - > the feeling of not being being able to do what the engineers are doing. 138 - > And therefore I 139 - > didn't knew what in the future I actually 140 - > will be bringing value of. 141 - > And that was something I had in the beginning. Now I know actually somebody 142 - > who can, who is not the inventor, but who can 143 - > explain what we have invented to people in 144 - > easy words is.
Is also something necessary and therefore 145 - > it changed completely. My confidence boosted. 146 - > We hold ourselves humble all the time. But still 147 - > after five years, after building up a not 148 - > small company anymore, rather a big company, 149 - > you have some self confidence in your decisions, in the 150 - > skills you have, and therefore it changed.
151 - > I see. From our audience, I 152 - > would like to Know what made you believe in your 153 - > startup, share in the comments and or tag us 154 - > wherever you're sharing this. We are on LinkedIn, we are an 155 - > ax, we're in blue sky threads and so on and so forth. 156 - > From a very good spot.
Let's take us 157 - > to your darkest day. There must have been a day when 158 - > a pilot failed a route, a funding round almost fell 159 - > through. What kept you from giving up? 160 - > So the most important thing in the whole 161 - > journey is Roman and Afcin the team.
162 - > Since we we had always like a customer 163 - > said I want to have the storage system, huge deal. Then they dropped. 164 - > We had funding rounds where we had really, 165 - > really less time actually to pay everybody. 166 - > And always we always kept each other's back.
167 - > That was incredibly important. If something doesn't 168 - > work out, it was not like I told you so. It was like how can 169 - > I help? Let's keep on doing it, otherwise we do something different 170 - > and we will be successful either way.
And this kind of 171 - > mindset helped us through a lot of. A lot of 172 - > phases which weren't good and but we 173 - > still keep on doing it because we said what shall we 174 - > lose? What have we. What can we lose?
And 175 - > therefore we just keep on going. The friendship 176 - > just grew and actually these 177 - > things together were like the resilience we needed to overcome this kind 178 - > of. Yeah. Darker times.
179 - > I actually plan to put right here some questions about your co 180 - > founder and team dynamics. That works really well. You've lived and worked 181 - > with your co founders for years. What is the biggest I do.
182 - > What is the biggest people lesson you had to learn the hard 183 - > way there? Actually my two confidants and I, 184 - > we still are living together and 185 - > we share a dog and we do a lot of 186 - > things together, sometimes also on vacation and things like this. Therefore 187 - > one thing I learned which is really important is having 188 - > people around you you can trust who have the same values and who 189 - > are loyal. This is such a relief in your 190 - > whole life and who actually keep on 191 - > want to to.
You want to compete with them, you want to be better. You 192 - > the best of yourself. Therefore this 193 - > is something which is really good. But on 194 - > the hard way.
The most important thing is 195 - > sales people can sell themselves really 196 - > good. Therefore if you think you 197 - > have the best salesperson on earth, you 198 - > can be completely wrong. And that's something we learned on 199 - > a hardware. A lot of times.
200 - > You and your two co founders still live together. Just between you 201 - > and me and something like 50,000 listeners, who's the one who doesn't do the 202 - > dishes? All three are not so good 203 - > at this. Therefore let's Call 204 - > it all of us.
I see, that's fine 205 - > but we don't. Do so much dishes anyways because 206 - > we are always late at work. But, but to be, to be fair, 207 - > we have really strict things who is 208 - > doing what. So for example, Roman is most of the times 209 - > like getting the groceries.
Afin is the one of the best 210 - > cooks and I do the rest. 211 - > Okay, I see going a little bit into 212 - > a potential emotional toll here you are operating at the heart 213 - > of energy, climate and impact. What's 214 - > been a personal toll of building this climate 215 - > tech rocket ship. So if you don't want to 216 - > make it your living or your your life, 217 - > then you will probably have a hard time to be 218 - > successful.
What I heard from my family 219 - > in the last few months, a lot of times you are, 220 - > you haven't been around at the weekends and so much 221 - > you weren't available over the last five years. So much. 222 - > Because I actually had a lot of things to 223 - > do and if I'm not doing that, I'm 224 - > trying to take my time and calm down. So 225 - > it needs also a lot of self discipline, 226 - > a lot of time and also a lot of focus on 227 - > yourself to be the best you can for the company, 228 - > for the team and for the growth.
So you, 229 - > you for sure you have your time with your family, your friends, but it's 230 - > lesser than before. Plus 231 - > I also do feel the value of just sitting 232 - > in the evening outside on our covered porch here. Just 233 - > be by yourself, do something you enjoy, for example, listening to an 234 - > audiobook and just have to do nothing. No, to do that gets 235 - > a very much higher value over time.
Totally. Having a 236 - > book, reading it and being completely by yourself 237 - > is incredibly helpful for calming down. Talking about 238 - > breaks here. We will be back after our short ad break 239 - > here.
Then we talk about make or break moments, founder 240 - > misconceptions and vulnerability to value. 241 - > Hope to have you back soon. 242 - > Hey guys, welcome back to the interview with David 243 - > from Voltfang. We've been talking about a lot 244 - > already and now I want to dig a little bit deeper.
The make 245 - > or break moment you've transitioned from a startup 246 - > to scale up. Was there point 247 - > when you had to pivot hard or double down? Yes, a 248 - > lot of times. So in the beginning 249 - > we started as a residual storage 250 - > provider.
So for the home storage we figured out 251 - > that's not the best way to grow. Therefore we decided 252 - > to pivot into commercial industrial. We did a 253 - > lot of things by ourselves which we said no, we need to 254 - > focus and focus and focus. Therefore 255 - > we needed to pivot from home storage to 256 - > commercial industrial storage system.
We needed to Also 257 - > change sometimes the business plan, the strategy, 258 - > so on, so forth. So yes, a lot of times 259 - > you need to always evolve yourself. You need to, you 260 - > have a lot of evolutions within yourself as 261 - > the company leader, but also the company as itself. 262 - > I was wondering, is there like one moment that extremely, 263 - > extremely has been sticking to your mind for that.
When 264 - > we started, we wanted to give the people 265 - > the opportunity to actually 266 - > produce and own their own energy. So if you 267 - > have, if you own a home or you are living in a home, then the 268 - > solar energy, the storage system, you can be 269 - > as self sufficient as possible. Giving away this 270 - > kind of dream of being able to 271 - > help everybody to decentralize the energy, that was a 272 - > hard moment. So what I mean is 273 - > the pivot from home storage to commercial industrial was 274 - > hard times.
You misconception. I'm very sure 275 - > not everything worked out the way it should be. 276 - > But what were you completely 277 - > wrong about when you launched like tech readiness, market 278 - > demand, or was this something else? And how did you fix it?
279 - > Yeah, the misconception is really in the 280 - > DNA of an engineer to be able to do everything 281 - > by yourself. So we started to, to develop and testing 282 - > facility, we, we wanted to develop 283 - > and certify a Bennett battery management system, the whole 284 - > system by itself, then the energy management system. So we 285 - > wanted to do everything on the horizontal 286 - > to actually on the tech side because we thought, okay, Tesla can do 287 - > it, why shouldn't we do it?
And there was 288 - > actually one of the biggest mixed misconceptions we, 289 - > we had since you need 290 - > to focus, you need to focus, focus. And again, you need to 291 - > focus to be able to grow fast. And that's 292 - > something we figured out rather sooner. But 293 - > for us it was late after two years or three years.
294 - > And therefore we burned a lot of money and 295 - > time by following different 296 - > paths, which in the end we needed to cut and just 297 - > focus on the main things we need to do. 298 - > You've shared openly about building in a 299 - > tough space, what part of yourself felt like a 300 - > liability, but turned out to be an asset. 301 - > So as I mentioned, when I was studying, 302 - > I always had the feeling that not being able to actually 303 - > get to be able to invent something new 304 - > is a huge liability.
To not be able to 305 - > understand everything on point in the first second 306 - > when you were in mechanics or physics or something like this. That 307 - > was in my opinion always a bad liability for 308 - > myself. But this 309 - > turned to be something my biggest asset 310 - > where because I believe being able to understand them and 311 - > after a while and then being able to also 312 - > explain it to everybody was extremely important. If you 313 - > are in a team of really true engineers.
314 - > And therefore this is something I believe 315 - > which is from liability to assets. 316 - > For our audience. Guys, what's 317 - > one founder trait you've turned from a liability in a 318 - > powerhouse? Let us know on threads or LinkedIn.
319 - > There are always surprises when you're an entrepreneur. 320 - > What was the most unexpected insight you've 321 - > learned from a customer? Supermarkets, airports or grid 322 - > operators? So 323 - > what we actually found out 324 - > was that all of the companies didn't have so much 325 - > knowledge about their energy space.
They didn't knew how 326 - > much they are actually consuming and how much they're producing, how much 327 - > they need, what they can actually avoid 328 - > on cost of the energy. Therefore that was 329 - > something we actually figured out really quickly that 330 - > we can, we need to show 331 - > everybody what they are capable of. And 332 - > this is something we didn't expect. But 333 - > that's actually also something which helps us a lot to grow because 334 - > there are so many potentials we with 335 - > our battery storage system can take for any kind of 336 - > customer.
Therefore that was amazing to figure out. If you are a huge 337 - > company like Bayer or something, then you know everything about your energy. 338 - > But everything below that there you don't have the capabilities 339 - > of actually figuring out everything. And there that's something 340 - > we want to help with.
It's like almost 341 - > my level. I know there's a power outlet, I plug it 342 - > in and every year I go to the cheapest provider. So 343 - > that's it. 344 - > Thank you for the answer so far.
Now I would like to look a little 345 - > bit ahead five years maybe. What's your moonshot for 346 - > Voltfang? A coal free grid. European energy independence.
347 - > So we want to decentralize Europe. We 348 - > want to give Europe the resilience of being able 349 - > to protect their energy transition, energy grids, everything. 350 - > And that's something where we believe as Volfang we 351 - > can help by becoming one of the biggest 352 - > energy providers in Europe. We want to put 353 - > smaller and bigger storage system everywhere in the countries 354 - > and then also connect them to a virtual power plant with who we 355 - > then can for example, which is also our vision 356 - > to shut down Weissweiler which has 1.
6 357 - > gigawatt. That's actually our 358 - > our moonshot of Voltfang getting rid of 359 - > coal as soon as possible with the resilient 360 - > energy grid of Europe. As a last question, I 361 - > would like you to reflect a little bit. If your 40 year old 362 - > self could speak to you now, what would they say about this 363 - > moment in Voltfunk's journey?
Good 364 - > question. If a 40 years old 365 - > self would tell me or would look at the moment right now, 366 - > they would probably say how The F 367 - > did. How the F did you come so far and how did 368 - > you manage to get over the next steps? Because right 369 - > now we have so many things which are incredibly cool, 370 - > which we are developing right now.
Where two or 371 - > three years ago it didn't. It was like slow growth. And now 372 - > we can really show the hockey stick, which I always promised the investors. 373 - > But now we are able to do that.
Therefore, I believe 374 - > they will. If you look into the retrospective, 375 - > then you will figure out how much myself, 376 - > Voltfang and the company grew within this short amount 377 - > of time, within the last year to the next one or two 378 - > years. I know that from some projects, looking 379 - > at the presentation, then looking at the real thing and think, huh, that really 380 - > worked out. What a surprise.
381 - > That's a. The funny thing is I'm. I never 382 - > know how we got here, but I know where we'll go in the 383 - > next years. 384 - > Okay, we close with this indirect Heisenberg quote.
385 - > David, with such a pleasure having you as guest. Best of luck and 386 - > hope to have you back in a few years doing an update. I would 387 - > love to. Thank you.
Have a good day. Bye. Bye. 388 - > Bye.
389 - > That's all, folks. Find more news, streams, 390 - > events and 391 - > interviews@www.startuprad.IO.
392 - > remember, sharing is car.
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