[Retired] Polymer Lithium Ion Battery – 850mAh L55-W34-T4.3


Availability: Out of stock SKU: 4005279 Category: Tags: , , ,


Note: Please only use the battery capacity in the title, not in the picture, this capacity and dimension size will always change a bit in every production batch.

These are very slim, extremely light weight batteries based on the new Polymer Lithium Ion chemistry. This is the highest energy density currently in production. Each cells outputs a nominal 3.7V at 850mAh! Comes terminated with a standard 2-pin JST-PH connector – 2mm spacing between pins. These batteries require special charging. Do not attempt to charge these with anything but a specialized LiPo charger.

Battery includes built-in protection against over voltage, over current, and minimum voltage.

Mechanical Size Info:

Mechanical size will always slightly changed based every production batch, for samples you can it directly, and if you want small batch product, then you can further customize the size.

  • Update: (Dec. 12th)
  • Dimensions:  55 mm (Thickness) * 34 mm (Width) * 3.4 mm (Length)
  • Weight: 16.1g


  • Excellent long-term self-discharge rates (<8% per month)
  • Robust power source under extreme conditions (-25 to 60C)
  • if should be no connector, it has then please feel free to cut it off
  • Nominal Capacity: 800mAh, 1C discharge
  • Charging current: Standard charge: 0.5C Fast Charge: 1.0C
  • Standard charging method: 0.5C CC (constant current) charge to 4.25V, then CV (constant voltage 4.2V) charge until the charging current ≤ 0.05C
  • Maximum charge current: 1A
  • Maximum discharge current: 1A
  • Discharge cut-off voltage: 2.75V
  • Discharge temperature: -20 ° C ~ +60 ° C
  • Charging time :2-4hrs (standard); 1.5hrs (fast)
  • Internal resistance: 80mΩ (Max)
  • Charge and discharge times: more than 800 times
  • Self-discharge: less than 400uA
  • Internal resistance: protection board internal resistance of less than 60mΩ, the internal resistance of the battery is less than 40mΩ
  • Protection functions: over-charging, over-discharge, over-current, over-voltage protection circuit, short circuit protection, over temperature protection
  • Batteries Dimensions Weight: see below show images] length: 50.0mm Max width: 34.0mm Max, thickness: 3.8mm Max

Shipping Note:

This product contains battery, will be only possible to be shipped by normal shipping service like Hongkong post, Belgium post, or similar, but not possible to be shipped by FedEx, DHL, UPS, read more on shipping.electrodragon.com.

Additional information

Weight 0.02 kg

1 review for [Retired] Polymer Lithium Ion Battery – 850mAh L55-W34-T4.3

  1. 5 out of 5

    Jacques (verified owner)

    Very nice small batteries. Too bad they are out of stock.

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