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Small rectangular lithium battery pack with flat silver finish and two contact pads

Estry

Estry standard battery 300mAh 3.8V for ZenWatch 2 WI501QF

SKU CH-AENK-QEFTA

Replacement lithium battery rated 300 mAh and 3.8 V fits ZenWatch 2 models WI501QF and WI501Q

  • Battery pack size1-pack
  • Battery typeLithium
  • Battery capacity300 mAh
  • Battery voltage rating3.8
  • Product typeBatteries
  • Exact-fit replacement for ZenWatch 2 WI501QF
  • 300 mAh lithium cell delivers reliable runtime
  • Built-in protection guards against overcharge and short circuits
  • Certified to ISO 9001, RoHS, CE and UN38.3
  • Slim 38.23 × 25.24 × 3.9 mm profile weighs 32.0 g

Direct replacement for ZenWatch 2

This Estry battery replaces the original 0B200-01630100 and C11N1540 cells in the ZenWatch 2 WI501QF, WI501QF and WI501Q models. It is a single lithium pack rated at 300mAh and 3.8V, built to the same specifications as the factory unit. The pack measures 38.23 x 25.24 x 3.9mm and weighs 32.0g.

Protection circuits and certifications

Overcharge, over-discharge, over-voltage and short-circuit protection are integrated to limit stress during daily charging cycles. The cell carries ISO9001, RoHS, CE, UN38.3 and MSDS certification, confirming compliance with safety and substance restrictions. Nominal energy is 1.37Wh at 3.8V.

Steady output under continuous wear

The protection circuitry maintains stable voltage during extended active use such as workout tracking or notification-heavy days. Capacity is rated at 360mAh in the manufacturer data, providing a consistent reserve for the watch processor and sensors without sudden drops.

How it compares

Measured against everything we stock in Household Batteries & Chargers, at today’s prices. Recalculated every night.

Price $13.99
Pricier than about 63% of the 10,440 comparable items (median $10.99).

Specifications

Product
Brand nameas
Product typeBatteries
Power
Battery typeLithium
Battery capacity300 mAh
Battery voltage rating3.8
In the box
Battery pack size1-pack

Questions about this item

How do I install the 300mAh 3.8V battery in my ZenWatch 2 WI501QF, and which step is most often missed?

Open the case, disconnect the old pack, match the 38.23 x 25.24 x 3.9mm dimensions and 32.0g weight, connect the new battery, then reseal the water-resistant adhesive — the step most people skip.

What maintenance or replacement will the 300mAh 3.8V lithium pack need over time?

The 1.37Wh cell has no user-serviceable parts; after the rated cycle life the 300mAh capacity fades and the entire pack must be swapped.

What limit appears first when the 300mAh 3.8V battery runs continuously in a ZenWatch 2?

The 300mAh capacity defines runtime; under sustained load the cell hits its 3.8V nominal voltage floor first, ending usable operation until recharged.

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