This is a fully open source laptop battery design. The design uses an attiny85, which can reply to the T420 motherboard's SMBUS requests. Arduino Uno/Mega (for programming the attiny85, Mega needs ...
Which is why [Alexander Parent] decided to take the road less traveled and scratch built a custom battery for his ThinkPad T420. By reverse engineering how the battery pack communicated with the ...
we covered [Alexander Parent]’s efforts to create an open source battery pack for the T420 based on the ATtiny85.
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