William Bergh

Hi, I'm William.
I trade batteries.

I'm an engineer, founder and trader, and I love solving problems: by trading and brokering surplus, by building an agentic trading OS, and by working hands-on with clients on circular projects. I also love building communities and events. What are you working on?

Trading

Surplus battery stock, live.

Unused, ex-stock and second-life cells, modules and packs from Europe, Asia and the US. The list updates itself, and new lots go out first on WhatsApp.

  • 120 brand new LG Energy Solution EM048128P6BA modules, NMC, US, 792 kWh
  • 3,400 brand new Jeep Renegade packs, NMC, Poland, 38.8 MWh
  • 60 used Fiat E-Ducato battery modules, NMC, Poland, 948 kWh
  • 18k unused CALB cells, LFP, India, 4.1 MWh

Got surplus of your own, batteries or anything else? Tell me about it and I'll find the buyer.

Follow on WhatsApp ↗
Software

Shape the world's best agentic trading OS.

Alongside my hands-on work, I'm building an agentic trading OS. It reads every message from all channels I use, files each message to the right contact and deal, matches stock to buyers, reasons through the next step and drafts the reply. It's honestly so good! It reduces my risk and helps me to run:

  • 3× more deals in parallel
  • 3× faster from listing to offer
  • 3× more and better messages sent

Trading teams can join the alpha as design partners and shape what it does next.

Become a design partner
Work together

Work with me, hands-on.

I help companies set up, improve and run their end-of-life and sourcing processes. You get my knowledge, my network and my passion for a more sustainable energy system.

Work together

Pick the collaboration that fits.

I'm flexible to accommodate your need for support. Let's discuss the best setup together.

Community · Beers & Batts

Come join the best battery meetup in Scandinavia!

When the right people come together, great things happen. Beers & Batts is where battery professionals connect, share, and tackle the energy transition's hardest problems.

Past speakers include Håkan Samuelsson (Volvo Cars), Elin Åkerström (Scania), Bo Normark (EIT InnoEnergy) and Ilka von Dalwigk (RECHARGE).

Credentials

Engineer, founder, trader.

  • 2020 – 2026Founder & CEO, Cling Systems, a circular trading marketplace for batteries. Raised €3.5M and grew to 20 people
  • 2024SET Award winner, Clean Energy and Storage, with Cling Systems
  • 2023 –Advisory board, BatteReverse, an EU project on EV battery reverse logistics
  • 2022 –Founder and host, Beers & Batts
  • 2020CEO for One Month, The Adecco Group Sweden (1 of 1,200+ applicants)
  • 2019 – 2020Thesis and R&D, Northvolt: battery return flows and design for recycling
  • 2015 – 2020M.Sc. Mechanical Engineering, Energy Systems, LTH Lund. Co-founded Lund's first electric Formula Student team
William Bergh presenting at the SET Tech Festival 2024 in Berlin
SET Tech Festival, Berlin 2024. Cling Systems won the SET Award in Clean Energy and Storage.
Credentials · Network

1,000+ companies in my network.

Cell makers and OEMs, recyclers, storage developers, carriers, investors and regulators. Most of what I do starts with knowing who to ask.

Why I build

Life is to be explored, and what we explore is worth keeping.

William Bergh on stage, opening Beers & Batts

I grew up in Stockholm watching David Attenborough tapes. A football scholarship took me to Hawaii to study environmental studies, where the natural world became very real. When I learned how much of the world's emissions come from energy, I came home to study energy systems at Lund.

In 2020, while writing my thesis on battery recycling, I founded Cling Systems to build a market for used batteries. Six years and 100+ trades later, I know three things: trades are very complex, trust is everything, and it all still runs on Excel, WhatsApp and email. That last part is what I'm rebuilding.

Agentic trading OS · alpha

Run three times the deals, with the same people.

  • 3×more deals in parallel
  • 3×faster from listing to offer
  • 3×more and better messages sent

Figures from my own trading desk, compared with the traditional way of working.

The problem
Today

Every thread runs through you.

WHATSAPPEMAILLINKEDINCALLSMEETINGSSELLERSBUYERSFREIGHT · ADRINSPECTIONINSURERSBANKSCUSTOMSYOU
  • Seven counterparties a deal, on five channels
  • Stock, prices and papers spread across chats, inboxes and Excel
  • Follow-ups fall through the cracks
  • An offer takes days
With the OS

One queue of decisions.

SELLERSBUYERSFREIGHT · ADRINSPECTIONINSURERSBANKSCUSTOMSAGENTIC TRADING OSYOU
  • Every thread lands in one place
  • Every message filed to the right deal
  • Drafts ready before you open them
  • Nothing goes out without your yes
The solution
  1. 01Each communication is understood.

    Email, WhatsApp, LinkedIn, Slack and meetings are read and turned into records: company, contact, deal and stock.

  2. 02Each supply, demand, operation and regulation is understood.

    Stock is matched to buyers. Every deal gets a next step, a price and a risk check, with ADR and CMR transport papers drafted.

  3. 03All messages at your fingertips.

    Replies, quotes and contracts are drafted and read a second time. You edit or approve, and nothing is sent without a yes.

Why it's different
  • Built from real experience

    Six years and 100+ battery trades in 20+ countries shaped every step.

  • Tested in hundreds of listings and projects

    Every listing and deal on my desk runs through it.

  • Gets better every day

    It learns from every approval and every edit.

Become a design partner.

Run your own deals on it during the alpha, and decide with me what it does next.

Trading · All listings

Surplus battery stock, live.

Unused, ex-stock and second-life cells, modules and packs from Europe, Asia and the US. Prices on request: message me about volume, logistics or paperwork.

19 lots · last added 8 Oct
19 of 19 lots · sorted by newest
  • Other

    1 used DV Power IBAR Battery

    Capacity not stated
    • Qty1
    • OriginSweden
    • Added8 Oct
  • Modules · NMC

    120 brand new LG Energy Solution EM048128P6BA modules

    792 kWh
    • Qty120
    • OriginUS
    • Added6 Oct
  • Packs · NMC · Pouch

    3,400 brand new Jeep Renegade packs

    38.8 MWh
    • Qty3,400 pack
    • OriginPoland
    • Added1 Oct
  • Modules · NMC · Cylindrical

    60 used Fiat E-Ducato battery modules

    948 kWh
    • Qty60 pcs
    • OriginPoland
    • Added1 Oct
  • Modules · NMC · Pouch

    19k brand new LG 622 pouch modules

    86.5 MWh
    • Qty19,440
    • OriginGermany
    • Added1 Oct
  • Packs · NMC

    51 brand new Proterra H1-15 packs

    3.8 MWh
    • Qty51 pcs
    • Origin
    • Added30 Sep
  • Packs · NMC

    7 used Kia Hyundai EV6 Ioniq packs

    539 kWh
    • Qty7 pack
    • OriginSweden
    • Added24 Sep
  • Cells · LFP · Prismatic

    18k unused CALB cells

    4.1 MWh
    • Qty18,000 cells
    • OriginIndia
    • Added17 Sep
  • Packs · NMC · Cylindrical

    63 unused Samsung SDI PEDR29-03-H02 packs

    163 kWh
    • Qty63 box
    • OriginUK
    • Added23 Aug
  • Packs

    28 used Mixed OEM ~28 used packs

    Capacity not stated
    • Qty28 unit
    • OriginLithuania
    • Added20 Aug
  • Cells · NMC · Pouch

    83k brand new Kokam KCL255103EN1 cells

    31.3 MWh
    • Qty82,500 cell
    • OriginGermany
    • Added18 Aug
  • Packs · NMC

    300 unused Zapp B-ZS-7210-1 packs

    216 kWh
    • Qty300 unit
    • OriginUK
    • Added14 Aug
  • Modules · NMC

    600 used Mercedes-Benz EB400 modules

    5.6 MWh
    • Qty600 module
    • OriginUS
    • Added3 Aug
  • Packs · NMC

    68 used Stellantis Mixed PHEV lot packs

    1 MWh
    • Qty68 packs
    • OriginBelgium
    • Added7 Jul
  • Systems

    2 brand new Timeshift Energy Storage EMS systems

    Capacity not stated
    • Qty2 units
    • OriginNetherlands
    • Added1 Jul
  • Cells · LFP · Prismatic

    10k brand new Lishen LP71173207-314Ah cells

    10 MWh
    • Qty10,000 cells
    • OriginChina
    • Added25 Jun
  • Packs

    3,000 brand new Leoch LRCF12-170 packs

    6.1 MWh
    • Qty3,000 unit
    • OriginBelgium
    • Added16 Jun
  • Modules · LFP · Cylindrical

    225 used Big Ass Battery modules

    1.6 MWh
    • Qty225 modules
    • OriginBelgium
    • Added28 May
  • Cells · NMC · Cylindrical

    40k brand new Volklec 21700-5000mAh cells

    720 kWh
    • Qty40,000 cell
    • OriginUK
    • Added27 May

Prices and availability on request. Surplus stock is sold as found, so what a listing shows is what I know.

Buyer FAQ

Questions buyers ask.

Can I buy LFP cells?

Yes. I list LFP prismatic and cylindrical cells most weeks, new, surplus and second-life, from OEMs and producers across Europe, North America and Asia. Whatever I have right now is in the list above. If you need a volume that isn't listed, message me and I'll tell you what's coming in.

Do you sell prismatic cells?

I trade prismatic, cylindrical and pouch cells in LFP, NMC and LTO, anything from A-matched to new-old-stock. Tell me the format, capacity and volume you're after and I'll match it from what I have now or what's on the way.

Can I buy surplus or end-of-life batteries?

Yes. Surplus, ex-fleet, ex-stock and end-of-life batteries are what I trade. I broker cells, modules, packs and full systems, and handle the waste classification, paperwork and dangerous-goods shipping that make used batteries safe and compliant to buy across borders.

Where can I buy cheap batteries in volume?

Surplus and second-life stock runs well below new, but I don't quote prices publicly. What it's worth comes down to chemistry, condition, volume and location. Message me what you're after and I'll give you a current indication.

What chemistries and formats do you supply?

LFP, NMC and LTO, at cell, module, pack and system level, in prismatic, cylindrical and pouch formats. State-of-health and test data are listed per batch where available; surplus stock is sold as found, so how much I know varies by batch. If you need a chemistry, format or volume that isn't in the list, message me and I'll match it against current or incoming stock.

How much do you know about each batch?

It varies. Surplus stock comes as found, so I share everything I have on chemistry, condition, history and test data, and I keep digging for more before and after a batch goes up. What you see in a listing is what I know.

Which regions do you ship to?

I've traded across 20+ countries. Stock is sourced from Europe, North America and Asia, and logistics partners classify and ship dangerous goods worldwide under ADR, IATA and IMDG rules, so where a batch sits is rarely a blocker. I can deliver to buyers across the EU and in markets including Ukraine, Poland, Turkey and India, with export documentation and customs classification handled as part of the trade.

How do I buy a listed lot?

Message me referencing the listing, or join the WhatsApp channel for live stock. I confirm availability, price and logistics, then structure the trade end to end on a contract built for batteries, with a defined inspection window, a clear claims process, and Incoterms and responsibilities agreed per trade.

WhatsApp channel

New lots go out first on WhatsApp.

Join the channel to see new stock the moment it lands, before it reaches this list.