Source for replacement battery for the Nest Thermostat v2.0
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This unit uses a Lithium-Ion rechargeable battery. It is charged by the control lines or an auxiliary charger. It should no need replacing.
If it does then you need to contact NEST for a replacement unit under their product warranty.
The 3rd & 4th gen units uses an Energizer Ultimate Lithium (L91) AA battery.
The 1st & 2nd gen units require a custom battery which is only available though NEST.
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