I want to replace the battery on a tablet, following this guide https://forum.xda-developers.com/sh...hield-tablet-fireproof-battery-t3226695/page6 Since I cannot buy the original battery I am considering using a nexus 7 battery.

Doing this involves either connecting the old and new batteries' protection circuits together or removing the protection circuit from the old battery and soldering it to the new battery. The tablet requires it's original protection circuit or it won't boot up. The two batteries have slightly different specs but both will fit. Original battery: 5200mah 3.8V. Nexus 7 battery: 4270mah 3.75V. IS this safe to do and if so which method should I go with?

Links to batteries: Nexus 7. https://www.replacebase.co.uk/asus-google-nexus-7-wi-fi-1st-generation-replacement-battery-original/

Original. https://d3nevzfk7ii3be.cloudfront.net/igi/f1pCPlNMXOIAvI2y.medium

 

As long as both batteries have the same connections and are both same voltage range 3.6v to 4.2v it will work, the capacity will just not last as long on full discharge, and may need to be recharged more often.

 

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As long as both batteries have the same connections and are both same voltage range 3.6v to 4.2v it will work, the capacity will just not last as long on full discharge, and may need to be recharged more often.

The battery that I am replacing is nearly 3 years old and is very worn out. I expect the new battery despite being lower capacity to still last longer.