CoinPower A4X Li-ion rechargeable buttons

Rechargeable Li-ion button cells for wearables

VARTA CoinPower lithium-ion rechargeable button cells provide a reliable high-power output, design flexibility, very safe operation in a small lightweight round form factor.

These 3.7V micro batteries are available in 7 different diameters and 3 different heights, with low impedance and a maximum capacity of 149mAh. All cell types have a cycle-life which is greater than 500 cycles with a remaining capacity of >80% of the nominal value if new. Even at elevated temperature and high discharge currents these button cells show excellent performance.


The CoinPower A4X can be charged with different 3 charging rates: standard, fast and rapid. Two data matrix codes are printed on lid and cup of each battery, in order to make every cell fully traceable. They are delivered in a state-of-charge of approximately 30% of their full capacity. This provides the best condition for long-term storage (shelf life of > 1 year) at the lowest self-discharge rate.

Key features
  • High energy density
  • Lightweight and small size
  • High discharge currents
  • Wound electrode design
  • Built-in safety device with chemical safety components
  • Fully automated production at 2 different locations in Germany
  • Sample and pre-series quantities ex Stock Texim in 3 formats: naked cell, wired or PCB pin

First deliveries of CoinPower A4X expected end Q1 2023.





Medical equipment

Smart car keys

Portable equipment


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Texim Europe BV: BTW/VAT Registration: NL814671871B01 | Dutch Chamber of Commerce: 08138443
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