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Small rectangular lithium-polymer battery pack with wires and connector

MPF Products

MPF Products 450mAh Battery Replacement for Nest Learning Thermostat

SKU CH-W6A8-QFAR2

A 3.7 V 450 mAh lithium-polymer pack replaces the original battery in compatible Nest Learning Thermostats and includes an installation tool

  • TypeLearning Thermostats
  • Parts1 Year Replacement Warranty.
  • Keeps your thermostat running with a 3.7V 450mAh lithium-polymer pack
  • Fits six Nest Learning models including T200377 through T200877
  • Replaces original part numbers P11GY1-01-S01 and 3701-0001-01
  • Includes a free installation tool for easy fitting
  • Backed by a 1 year replacement warranty from MPF Products

450mAh Lithium-Polymer Replacement Battery

This 3.7V 450mAh lithium-polymer pack replaces the original P11GY1-01-S01 or 3701-0001-01 cell inside Nest Learning Thermostat models T200377 through T200877. It restores the internal power reserve that keeps the thermostat operating during heating and cooling cycles. The pack is supplied new with a one-year replacement warranty from MPF Products.

Upgrade From a Depleted Original Cell

The jump is worth it when the thermostat loses its schedule, drops Wi-Fi connection or shows a low-battery warning after a power interruption. A fresh 1.67Wh pack restores reliable operation without replacing the entire thermostat unit. This battery is not for users whose thermostat model falls outside the listed T200377 to T200877 range or who need a higher-capacity cell than 450mAh.

Simple Swap With Included Tool

The package includes a free installation tool to open the thermostat housing and disconnect the old pack. Typical issues occur if the connector is not fully seated or if the replacement is attempted without first removing the thermostat from its base. No soldering is required, but care must be taken not to damage the delicate ribbon cable during reassembly.

Highlights

  • Keeps your thermostat running with a 3.7V 450mAh lithium-polymer pack
  • Fits six Nest Learning models including T200377 through T200877
  • Replaces original part numbers P11GY1-01-S01 and 3701-0001-01
  • Includes a free installation tool for easy fitting
  • Backed by a 1 year replacement warranty from MPF Products

Specifications

BrandMPF Products
ModelIntended for/Compatible with the Following Nest Thermostat Models: Nest Learning Thermostat T200377, Nest Learning Thermostat T200477, Nest Learning Thermostat T200577, Nest Learning Thermostat T200677, Nest Learning Thermostat T200777, Nest Learning Thermostat T200877.
TypeLearning Thermostats
Parts1 Year Replacement Warranty.

Questions about this item

Does this battery physically fit inside the Nest Learning Thermostat T200577 base?

Yes, the 3.7V 450mAh lithium-polymer pack is built to the P11GY1-01-S01 form factor so it seats directly in the thermostat's internal battery compartment without adapters.

What is the installation step users most often miss when swapping the 3701-0001-01 cell?

After inserting the new pack, you must reattach the thermostat display to its base and wait for the unit to power up and recalibrate its charge circuit before assuming the job is done.

When will the 1.67Wh lithium-polymer pack typically need replacement again?

Expect roughly one to two years of service; when the thermostat starts losing its schedule or Wi-Fi connection during brief power interruptions, the cell has degraded and should be swapped.

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