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Small rectangular lithium battery pack, 36.62 by 26.7 by 7.6 mm, 31.0 g, blue wrap with printed labels

Estry

Estry TL7812 3.7V 240mAh standard battery

SKU CH-4DKG-M5KWP MPN TL7812

A 3.7 V, 240 mAh lithium replacement battery compatible with TL7812, TL7912, TL7910, TL7810 and TL7800 models

  • TypeBatteries
  • Battery Pack1-pack
  • Battery TypeLithium
  • Battery Capacity240mAh
  • Battery Voltage3.7
  • Compatible with TL7812 TL7912 TL7910 TL7810 TL7800 models
  • 240mAh lithium capacity delivers reliable power for daily use
  • 7V voltage matches original specifications exactly
  • 89Wh energy rating ensures consistent performance
  • ISO9001 RoHS CE UN38.3 MSDS certified for safety assurance

Direct replacement battery

The Estry TL7812 is a 3.7V 240mAh lithium cell built to match the original specifications for models TL7812, TL7912, TL7910, TL7810 and TL7800. It delivers .89Wh of energy in a 36.62 x 26.7 x 7.6mm form factor weighing 31.0g. The pack includes overcharge, over-discharge, over-voltage and short-circuit protection for safer operation.

Upgrades worn or failed original cells

This battery replaces the BT191665 part number when the factory pack no longer holds a charge or shows reduced runtime. The jump is worth it when the device powers off unexpectedly or cannot complete a full duty cycle on a single charge. Buyers who need a higher capacity than 240mAh or a different voltage should look elsewhere because this unit matches the original ratings exactly.

Simple two-wire swap with polarity check

Installation consists of disconnecting the old pack and connecting the new one using the existing leads; no soldering is required if the connector matches. The most common issue is reversed polarity, so verify the positive and negative wires before seating the connector. The cell carries ISO9001, RoHS, CE, UN38.3 and MSDS certification for compliance assurance.

Highlights

  • Compatible with TL7812 TL7912 TL7910 TL7810 TL7800 models
  • 240mAh lithium capacity delivers reliable power for daily use
  • 7V voltage matches original specifications exactly
  • 89Wh energy rating ensures consistent performance
  • ISO9001 RoHS CE UN38.3 MSDS certified for safety assurance

Specifications

TypeBatteries
Battery Pack1-pack
Battery TypeLithium
Battery Capacity240mAh
Battery Voltage3.7

Questions about this item

What are the exact dimensions of the TL7812 battery to check if it fits my device?

The battery measures 36.62 x 26.7 x 7.6 mm and weighs 31.0 g.

How do I install the replacement battery, and what is a common mistake to avoid?

Power off the device, open the battery compartment, disconnect the old pack, and connect the new BT191665 battery matching the polarity; a common mistake is forcing the connector in reversed.

What replacement will this lithium pack need over its service life?

The 3.7 V 240 mAh lithium cell will eventually lose capacity; when run time becomes too short, replace it with another TL7812-compatible pack rated at 0.89 Wh.

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