Once it has been disconnected from the pcb you could test it with a DMM (Digital Multimeter -Voltmeter function) to check its' voltage level.
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+
If it has a very low reading and since it is not responding to being charged it may have been depleted beyond recovery and will need to be replaced.
I've read that the battery is/was especially made for Nest, who do not supply replacements.
The original battery information (as viewed in the ifixit guide) is a 284449 3.7V battery. The 284449 indicates 2.8mm depth x 44mm width x 49mm length.
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Finding a battery with such a small depth measure of 2.8mm(combined with the other dimensions) as the original has proved very difficult. This is the closest one that I could find. You may have better luck. This [https://www.aliexpress.com/item/China-supplier-shenzhen-factory-OEM-303040-3-7v-lipo-rc-battery-450mah-for-rc-li-polymer/32705034265.html?spm=2114.search0104.8.43.345d59dbkGzRTn&priceBeautifyAB=0|battery] is a 303040 3.7V battery (3.0mm x 30mm x 40 mm) which makes it 0.2 mm too thick. Hopefully there may be a bit of clearance in the case so that you can use this as a replacement.
+
Finding a battery with such a small depth measure of 2.8mm(combined with the other dimensions) as the original has proved difficult. This is the closest one that I could find. You may have better luck. This [https://www.aliexpress.com/item/China-supplier-shenzhen-factory-OEM-303040-3-7v-lipo-rc-battery-450mah-for-rc-li-polymer/32705034265.html?spm=2114.search0104.8.43.345d59dbkGzRTn&priceBeautifyAB=0|battery] is a 303040 3.7V battery (3.0mm x 30mm x 40 mm) which makes it 0.2 mm too thick. Hopefully there may be a bit of clearance in the case so that you can use this as a replacement.
Once it has been disconnected from the pcb you could test it with a DMM (Digital Multimeter -Voltmeter function) to check its' voltage level.
I've read that the battery is/was especially made for Nest, who do not supply replacements.
The original battery information (as viewed in the ifixit guide) is a 284449 3.7V battery. The 284449 indicates 2.8mm depth x 44mm width x 49mm length.
-
Finding a battery with such a small depth measure (combined with the other dimensions) as the original has proved very difficult. This is the closest one that I could find. You may have better luck. This [https://www.aliexpress.com/item/China-supplier-shenzhen-factory-OEM-303040-3-7v-lipo-rc-battery-450mah-for-rc-li-polymer/32705034265.html?spm=2114.search0104.8.43.345d59dbkGzRTn&priceBeautifyAB=0|battery] is a 303040 3.7V battery (3.0mm x 30mm x 40 mm) which makes it 0.2 mm too thick. Hopefully there may be a bit of clearance in the case so that you can use this as a replacement.
+
Finding a battery with such a small depth measure of 2.8mm(combined with the other dimensions) as the original has proved very difficult. This is the closest one that I could find. You may have better luck. This [https://www.aliexpress.com/item/China-supplier-shenzhen-factory-OEM-303040-3-7v-lipo-rc-battery-450mah-for-rc-li-polymer/32705034265.html?spm=2114.search0104.8.43.345d59dbkGzRTn&priceBeautifyAB=0|battery] is a 303040 3.7V battery (3.0mm x 30mm x 40 mm) which makes it 0.2 mm too thick. Hopefully there may be a bit of clearance in the case so that you can use this as a replacement.
Once it has been disconnected from the pcb you could test it with a DMM (Digital Multimeter -Voltmeter function) to check its' voltage level.
I've read that the battery is/was especially made for Nest, who do not supply replacements.
The original battery information (as viewed in the ifixit guide) is a 284449 3.7V battery. The 284449 indicates 2.8mm depth x 44mm width x 49mm length.
-
Finding a battery with such a small depth measure (combined with the other dimensions) as the original has proved very difficult. This is the closest one that I could find. You may have better luck. [https://www.aliexpress.com/item/China-supplier-shenzhen-factory-OEM-303040-3-7v-lipo-rc-battery-450mah-for-rc-li-polymer/32705034265.html?spm=2114.search0104.8.43.345d59dbkGzRTn&priceBeautifyAB=0|This] one is a 303040 3.7V battery (3.0mm x 30mm x 40 mm) which makes it 0.2 mm too thick. Hopefully there may be a bit of clearance in the case so that you can use this as a replacement.
+
Finding a battery with such a small depth measure (combined with the other dimensions) as the original has proved very difficult. This is the closest one that I could find. You may have better luck. This [https://www.aliexpress.com/item/China-supplier-shenzhen-factory-OEM-303040-3-7v-lipo-rc-battery-450mah-for-rc-li-polymer/32705034265.html?spm=2114.search0104.8.43.345d59dbkGzRTn&priceBeautifyAB=0|battery] is a 303040 3.7V battery (3.0mm x 30mm x 40 mm) which makes it 0.2 mm too thick. Hopefully there may be a bit of clearance in the case so that you can use this as a replacement.
Once it has been disconnected from the pcb you could test it with a DMM (Digital Multimeter -Voltmeter function) to check its' voltage level.
I've read that the battery is/was especially made for Nest, who do not supply replacements.
The original battery information (as viewed in the ifixit guide) is a 284449 3.7V battery. The 284449 indicates 2.8mm depth x 44mm width x 49mm length.
-
If the battery has failed then the nearest one that I have found is [https://www.aliexpress.com/item/China-supplier-shenzhen-factory-OEM-303040-3-7v-lipo-rc-battery-450mah-for-rc-li-polymer/32705034265.html?spm=2114.search0104.8.43.345d59dbkGzRTn&priceBeautifyAB=0|this] one.
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Unfortunately this one is a 303040 3.7V battery (3.0mm x 30mm x 40 mm) which makes it 0.2 mm too thick. Hopefully there may be a bit of clearance in the case so that you can use this as a replacement.
+
Finding a battery with such a small depth measure (combined with the other dimensions) as the original has proved very difficult. This is the closest one that I could find. You may have better luck. [https://www.aliexpress.com/item/China-supplier-shenzhen-factory-OEM-303040-3-7v-lipo-rc-battery-450mah-for-rc-li-polymer/32705034265.html?spm=2114.search0104.8.43.345d59dbkGzRTn&priceBeautifyAB=0|This] one is a 303040 3.7V battery (3.0mm x 30mm x 40 mm) which makes it 0.2 mm too thick. Hopefully there may be a bit of clearance in the case so that you can use this as a replacement.
Once it has been disconnected from the pcb you could test it with a DMM (Digital Multimeter -Voltmeter function) to check its' voltage level.
I've read that the battery is/was especially made for Nest, who do not supply replacements.
The original battery information (as viewed in the ifixit guide) is a 284449 3.7V battery. The 284449 indicates 2.8mm depth x 44mm width x 49mm length.
If the battery has failed then the nearest one that I have found is [https://www.aliexpress.com/item/China-supplier-shenzhen-factory-OEM-303040-3-7v-lipo-rc-battery-450mah-for-rc-li-polymer/32705034265.html?spm=2114.search0104.8.43.345d59dbkGzRTn&priceBeautifyAB=0|this] one.
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Unfortunately this one is a 303040 3.7V battery (3.0mm x 40mm x 40 mm) which makes it 0.2 mm too thick. Hopefully there may be a bit of clearance in the case so that you can use this as a replacement.
+
Unfortunately this one is a 303040 3.7V battery (3.0mm x 30mm x 40 mm) which makes it 0.2 mm too thick. Hopefully there may be a bit of clearance in the case so that you can use this as a replacement.
Hi @skinsfan825
Here is a link to the ifixit [guide|30626] guide.
This should help you gain access to the battery.
Once it has been disconnected from the pcb you could test it with a DMM (Digital Multimeter -Voltmeter function) to check its' voltage level.
I've read that the battery is/was especially made for Nest, who do not supply replacements.
The original battery information (as viewed in the ifixit guide) is a 284449 3.7V battery. The 284449 indicates 2.8mm depth x 44mm width x 49mm length.
If the battery has failed then the nearest one that I have found is [https://www.aliexpress.com/item/China-supplier-shenzhen-factory-OEM-303040-3-7v-lipo-rc-battery-450mah-for-rc-li-polymer/32705034265.html?spm=2114.search0104.8.43.345d59dbkGzRTn&priceBeautifyAB=0|this] one.
Unfortunately this one is a 303040 3.7V battery (3.0mm x 40mm x 40 mm) which makes it 0.2 mm too thick. Hopefully there may be a bit of clearance in the case so that you can use this as a replacement.