Website:
powerten.in
Job details:
Battery Pack Prototype EngineerPowerten · Full-Time · On-site
About PowertenWe build Battery Energy Storage Systems (BESS) from the ground up. Not software wrappers around someone else's hardware. Not integration work on finished modules. We design, assemble, and test the actual packs — cells, BMS, enclosures, harnesses, and all the things that have to work together before a watt of energy goes anywhere useful.
We're at the stage where the prototypes you build will directly become the products we ship. That means the person in this role carries real weight. If that sounds exciting rather than stressful, keep reading.
What this role actually isYou'll own the physical development of battery pack prototypes — from cell selection and layout through BMS configuration, harness assembly, and functional testing. You'll work with evolving specs, make decisions under uncertainty, and be the person who figures out why something isn't working and how to fix it.
This is not a systems integration role. It's not a "follow the SOP and report up" role. You'll be building things with your hands, debugging things that don't behave, and iterating until they do.
What you'll do- Assemble and test lithium-ion battery packs (prismatic, cylindrical, pouch) at the prototype stage
- Configure and debug BMS hardware — balancing, SOC estimation, fault thresholds, communication
- Build and rework wiring harnesses from schematics; read and interpret electrical diagrams independently
- Run electrical and thermal characterisation tests; document what you find, not just what worked
- Identify failure modes in your own prototypes and treat each rebuild as a structured learning exercise
- Work within high-voltage DC systems (48V–400V) safely and without hand-holding
- Collaborate directly with the founders and engineering team — there's no insulation layer here
What we're looking forYou've done the work yourself. Not supervised it. Not reviewed someone else's. You've personally assembled packs, configured a BMS, crimped a connector, and powered something up — and you've had things fail on you and figured out why.
You know your chemistries. You can speak to the practical differences between LFP, NMC, and NCA — not from a datasheet, but from experience selecting or working with them.
You're comfortable with high-energy systems. You know why 400V DC is different from 400V AC. You have an actual pre-power checklist in your head, not because someone told you to.
You work well in the incomplete. Specs change. Requirements shift. A startup at this stage doesn't hand you a finished design document. You need to be able to make reasonable decisions with the information available and flag when something needs to be resolved before you proceed.
You own your work. You don't wait for someone to document what you built. You don't pass problems upstream. If a prototype needs to be rebuilt three times, you rebuild it — and each time, you know exactly why you're doing it differently.
You're here for BESS. Not because it's adjacent to EVs or "clean energy" broadly. Because stationary storage is a specific, interesting, underserved problem — and you have a point of view on it.
Experience- 3+ years of hands-on experience with battery systems, power electronics, or energy hardware
- Direct experience with BMS configuration, debugging, or integration
- Comfortable assembling and testing battery packs independently
- Experience with prototyping tools: multimeters, oscilloscopes, thermal cameras, load testers, spot welders
- Worked in or alongside high-voltage DC environments
Formal education in electrical, mechanical, or energy engineering is a plus — but we care far more about what you've built than where you studied.
What it's like to work hereThe team is small. Decisions happen fast. You'll have access to the people making product and business decisions, and your technical judgment will directly influence both.
We don't have a playbook for everything yet. Some things will be figured out as we go — and you'll be part of figuring them out. If you need a fully structured environment to do good work, this probably isn't the right fit. If you do your best work when you have real ownership and real stakes, it might be exactly right.
Click on Apply to know more.