We take cryptocurrency — so the coins you hold can buy real hardware.Pay in crypto, spend it on real hardware. Free insured shipping worldwide over $399. Plain, unbranded boxes, sent from Germany.Free insured shipping over $399. Your rate is locked for 30 minutes once checkout opens.Rate locked 30 minutes. Every item sealed, serial-checked and covered by a 24-month warranty.Sealed, 24-month warranty.

Saved items Sign in
Small rectangular lithium battery pack with gold contacts, 21.5 by 19.8 by 5.1 mm, silver-grey finish

Estry

Estry SM-R900 Battery Replacement 260mAh 3.88V

SKU CH-4B3R-6YK2C MPN SM-R900

A 260mAh 3.88V lithium replacement battery compatible with SM-R900, SM-R905 and Watch 5 40mm models

  • TypeBatteries
  • Battery Pack1-pack
  • Battery TypeLithium
  • Battery Capacity260mAh
  • Battery Voltage3.88
  • 260 mAh capacity restores original runtime for Watch 5 40 mm
  • 88 V lithium cell matches factory voltage for safe operation
  • 5 × 19.8 × 5.1 mm dimensions fit SM-R900 and SM-R905 precisely
  • Built-in overcharge, over-discharge and short-circuit protection extends cell life
  • RoHS, CE, ISO 9001 and UN 38.3 certified for quality assurance

Direct Replacement for Watch5 40mm

The Estry SM-R900 is a lithium-ion cell built to the original 260mAh 3.88V specification. It fits the Galaxy Watch5 40mm and the SM-R900 or SM-R905 model numbers and matches the EB-BR900ABY and GH43-05112A part references. Safety circuits protect against over-charge, over-discharge, over-voltage and short-circuit conditions.

For owners of the 40mm Watch5 needing a fresh cell

Suitable for anyone whose Watch5 40mm no longer holds a charge and who can open the device to swap the pack. Not for owners of the larger Watch5 size, earlier Galaxy Watch generations, or any smartwatch that uses a different part number or physical layout. Professional installation is recommended if you lack the tools or experience.

260mAh 3.88V lithium pack in a 21.5 x 19.8 x 5.1mm

Capacity and voltage must match the original 260mAh 3.88V rating for the watch to report capacity correctly and to avoid charging faults. The cell measures 21.5 by 19.8 by 5.1mm and weighs 30.0g. It carries ISO9001, RoHS, CE, UN38.3 and MSDS certifications.

Highlights

  • 260 mAh capacity restores original runtime for Watch 5 40 mm
  • 88 V lithium cell matches factory voltage for safe operation
  • 5 × 19.8 × 5.1 mm dimensions fit SM-R900 and SM-R905 precisely
  • Built-in overcharge, over-discharge and short-circuit protection extends cell life
  • RoHS, CE, ISO 9001 and UN 38.3 certified for quality assurance

Specifications

TypeBatteries
Battery Pack1-pack
Battery TypeLithium
Battery Capacity260mAh
Battery Voltage3.88

Questions about this item

How do I confirm the 260mAh battery is working correctly after installing it in my SM-R900?

After installation, the watch should power on, hold a charge through normal daily use, and show the expected battery percentage without sudden drops or overheating.

What comes in the 1-pack and do I need to buy any tools or adhesive separately?

The pack contains one 260mAh lithium battery measuring 21.5 x 19.8 x 5.1mm; installation tools and adhesive are not included and must be sourced separately.

Which version matches my watch — the SM-R900, SM-R905 or Watch 5 40mm — and how do I tell them apart?

All three model codes refer to the same 40mm Watch 5; verify the original part number EB-BR900ABY or GH43-05112A on your old battery to confirm compatibility.

Also in this aisle

People compared these

Same shelf, same checkout — eight coins and a 30-minute rate lock.