Polymer Li-Po · 11 min · 19 Sept 2026
Designing a Cell for Ten Years, Not Five Hundred Cycles
Calendar ageing and cycle ageing are separate budgets. For idle-dominant products, storage voltage and cell temperature decide the
Read more →Polymer Lithium Battery
High energy density Li-Po cells engineered for thin, light, and mission-critical applications. From wearables to medical devices, our polymer lithium batteries deliver consistent performance across thousands of cycles.
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Overview
What is a Polymer Lithium Battery?
Polymer lithium batteries (Li-Po) use a gel-like polymer electrolyte instead of the liquid electrolyte found in conventional lithium-ion cells. This allows for ultra-thin profiles, flexible form factors, and improved safety under abuse conditions. Zufek manufactures Li-Po cells from 30 mAh up to 20 Ah, with thicknesses as low as 0.4 mm.
Variants
Standard catalogue and full-custom design.
Same chemistry, same QC. Pick the catalogue when speed matters; pick custom when geometry, capacity or BMS need to be designed around your enclosure.
Standard Li-Po Cells
Pre-designed cells with industry-standard footprints, MOQ 500 pcs, lead time 2 weeks.
Custom Li-Po Cells
Bespoke dimensions, capacity, connectors and BMS integration. ODM/OEM from prototype to mass production.
Catalogue models in this series:
- LP-503562 1200mAh LP-503562Standard Li-Po cell for IoT and smart home
Specifications
Technical envelope & performance.
Extended ranges available on request — speak to engineering for non-standard targets.
| Parameter | Range | Unit |
|---|---|---|
| Nominal Voltage | 3.7 | V |
| Capacity | 30 – 20,000 | mAh |
| Energy Density | Up to 260 | Wh/kg |
| Cycle Life | ≥ 500 (80% retention) | cycles |
| Operating Temp (Discharge) | -20 to +60 | °C |
| Operating Temp (Charge) | 0 to +45 | °C |
| Min. Thickness | 0.4 | mm |
| Self-Discharge | < 3 | %/month |
01
Dimensions
Any L × W × T from 20×15×0.4 mm to 200×150×12 mm
02
Capacity
Tunable from 30 mAh to 20 Ah
03
Connectors
JST-PH, Molex, custom pinouts
04
Protection
PCM/PCB with OVP, UVP, OCP, SCP, NTC
05
Cable & Length
AWG 24-30, length per spec
06
Labeling
Custom shrink wrap, brand labels, barcodes
Manufacturing & QC
From Prototype to Mass Production
All Li-Po cells are manufactured in our ISO 9001 certified facility with automated stacking, vacuum sealing, formation and grading. Every batch undergoes 100% capacity, IR and OCV inspection.
Insights
Articles in this topic cluster.
Engineering deep-dives that help your hardware team specify the right cell, the first time.
Polymer Li-Po · 8 min · 09 Sept 2026
Storage State of Charge: What Happens to Cells in Your Warehouse
A cell sitting in a box is still ageing. How fast depends almost entirely on two numbers you control: its state of charge and the
Read more →Polymer Li-Po · 8 min · 29 Jul 2026
Picking a C-Rate: Why Your Cell Runs Hot at Spec
Capacity sizing tells you how big the cell is. C-rate sizing tells you whether it survives the load. The two are different calcula
Read more →Polymer Li-Po · 9 min · 12 Jun 2026
How to Read a Li-Po Datasheet Without Getting Burned
Every number on a lithium polymer datasheet was measured under conditions the sheet may not print. Here is what each line actually
Read more →Polymer Li-Po · 6 min · 03 May 2026
How to Choose Li-Po Battery Capacity for IoT Devices
A practical guide for hardware engineers selecting polymer lithium cells for low-power IoT applications.
Read more →Polymer Li-Po · 12 min · 03 May 2026
IEC 62133-2:2017 + Amendment 1: The Complete Test Walkthrough
A compliance lead's plain-English guide to every mandatory and conditional test in IEC 62133-2, with cost estimates, timelines and
Read more →More in this cluster:
- LiPo Battery Swelling: Root Causes, Risk Levels and Design Fixes
- Protection PCM vs Smart Battery: When to Use Which
- Four Mechanisms of Capacity Fade in Lithium-Polymer Cells
- Sizing a Cell From a Power Profile
- CC/CV Charging: How the Protocol Works and Where It Goes Wrong
- Supply Chain Notes: Cobalt, Nickel, LFP Outlook
- Reading a Cycle-Life Curve Honestly
- Series vs Parallel Cell Configurations: A Pack Designer's Guide
- HV LCO at 4.48 V: Density Gains for Wearables
- BMS Topology Selection: A Decision Framework for OEMs
- Formation Cycling: The Manufacturing Step That Sets a Cell's Entire Life
- Solid-State: Hype vs Reality for Consumer Electronics
- Thermal Runaway: What Triggers It, How to Design Against It
- VC, FEC and LiDFOB: What Electrolyte Additives Do for LiPo Cells
Compliance
Independently certified.
Each shipment carries valid UN 38.3 test summary, MSDS and Certificate of Conformity. Additional reports on request.
UN 38.3IEC 62133CERoHSMSDS
FAQ
Common questions.
What is the minimum order quantity (MOQ) for custom Li-Po cells?
For custom designs the typical MOQ is 3,000 pcs; standard catalog cells start at 500 pcs.
How long does sample production take?
Tooling and prototype samples are typically delivered within 25-35 working days after design freeze.
Do your batteries meet UN 38.3 for air shipping?
Yes, all production cells are tested per UN Manual of Tests and Criteria, Section 38.3, and ship with valid test summaries.
What protection circuits do you integrate?
PCM with overvoltage, undervoltage, overcurrent and short-circuit protection. NTC thermal monitoring is optional.
Ready for a feasibility review?
Send us your envelope and target spec — engineering will respond within one business day.
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