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-polymer battery pack with wires and connector

MPF Products

MPF Products 200mAh 3.7V Battery TL363844 for Nest Gen 1 T100577

SKU CH-9JQS-JTCC4

A 3.7V 200mAh lithium-polymer rechargeable battery pack replaces the TL363844 cell in a Nest Learning Thermostat Gen 1 T100577 and includes installation tools

  • Product typeLearning Thermostats
  • Parts warranty1-Year Replacement Warranty.
  • Compatible with Nest Gen 1 T100577 thermostat
  • 7V 200mAh lithium-polymer rechargeable battery pack
  • Replaces TL363844 part number directly
  • Includes free installation tools for easy fitting
  • 1-year replacement warranty from MPF Products

MPF Products 200mAh Battery for Nest Gen 1

This 3.7V lithium-polymer rechargeable battery pack replaces part number TL363844 in the Nest Learning Thermostat first generation model T100577. It supplies 74Wh capacity and restores power reserve when the original cell no longer holds charge. The unit is a direct replacement for the factory-fitted pack in that specific thermostat.

Installation ease and common issues

Free installation tools are included so the swap can be completed with basic hand tools. The main difficulty is opening the thermostat base without damaging the display ribbon cable. Reversing the connector polarity during reassembly will prevent the unit from powering on. A 1-year replacement warranty covers defective cells.

Pre-order compatibility checks

Confirm the thermostat label reads Nest Learning Thermostat Gen 1 and shows model T100577 before ordering. Verify the existing battery carries part number TL363844 on its label. This pack is not suitable for later Nest generations or other thermostat brands.

How it compares

Measured against everything we stock in Thermostats & Thermostat Accessories, at today’s prices. Recalculated every night.

Price $5.99
Cheaper than about 98% of the 286 comparable items (median $78.49).

Specifications

Product
Brand nameMPF Products
Model nameIntended for/Compatible with the Following Thermostat Models: Nest Learning Thermostat (Gen 1), T100577.
Product typeLearning Thermostats

Questions about this item

How do I confirm the 3.7V 200mAh battery is working after installing it in my Nest Gen 1 T100577?

After installation the thermostat should power on immediately, show a charging indicator, and hold its schedule without losing Wi-Fi connection during HVAC cycles.

What comes in the package and what must I supply myself?

The pack includes the 74Wh lithium-polymer battery and free installation tools; you only need a small Phillips screwdriver to open the thermostat base.

Which battery version matches the TL363844 part number for my first-generation Nest?

This 200mAh 3.7V pack is the direct replacement for part TL363844 and is listed as compatible with the Nest Learning Thermostat Gen 1 model T100577.

More in Thermostats & Thermostat Accessories

Similar items