Company — Shenzhen Polymen Batteries CO., LTD.

What we are

We own the specification, the certification file and the after-sales obligation.

Shenzhen Polymen Batteries CO., LTD. is an OEM/ODM battery partner based in Shenzhen. We have been building lithium packs since 2014, starting in waterproof and marine applications where a seal failure is not a warranty claim but a lost vessel.

Production is carried out at our contracted partner facilities — a C&I storage line in Guangdong and a long-standing LFP cell and large-format ESS base in Hubei. Product and liability responsibility sits with us, not with an unnamed third party you discover later.

One accountable contact. The engineer who answers your pre-sales question signs off the FAT and takes your after-sales call.
NDAs and registration documents on request, before you share a tender specification.
Manufacturer authorisation letter available for any dossier that requires one.

Why this matters to a buyer

Six gates, and the two that decide whether the rest get read.

European C&I storage procurement runs as a serial set of checks. A response that only discusses cycle life and efficiency is read at gate three and then discarded.

Counterparty risk

Who is actually behind this? A named entity, a fixed address, one contact, and a letter you can file.

Compliance and insurability

Certificates, test reports and serial traceability that an insurer will accept.

Will it fit on site?

Dimensioned drawings, clearances and fire separation, issued with the datasheet.

Whole-life economics

Cycle life and efficiency quoted with their measurement conditions attached.

Delivery and terms

4–6 weeks standard, 8–10 weeks project-specific, plus 5–7 weeks sea freight to Rotterdam.

Price you can compare

The assumption set behind a price is published, so two offers can be read side by side.

How we are different

Documents before products.

UN 38.3, test reports, certificates and manuals ship with every consignment — not on request, and not after the third reminder. The documentation is the product as much as the cabinet is.

Every unit carries a unique serial code traceable from cell to finished pack through MES. When a cell batch is queried two years later, the answer is a database lookup, not an email chain.

See the document list

2014 — founded in Shenzhen

Waterproof and marine lithium packs, IP68, hot-swap underwater. Sealing and thermal discipline comes from here.

OEM / ODM growth

Custom BMS, enclosures and connectors for integrators across Europe, North America and Asia.

C&I storage line — Guangdong

Liquid-cooled cabinets, PV-storage all-in-one, rack modules. The line our C&I product family is built on.

LFP cell and ESS base — Hubei

Long-standing cell and large-format ESS capacity, including 20 ft containerised systems.

Tell us the duty cycle. We will send the datasheet.

Voltage window, energy, power and C-rate, duty profile, installation environment, destination country. That is enough for a first proposal.

Request a proposal Email us

Who you are actually buying from