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How to Test Battery Health in GRUNDIG VCP 3930 with a Multimeter, Arduino, or Raspberry Pi?

As a follow-up to this question, I own a GRUNDIG VCP 3930 vacuum cleaner (which uses a 25.2V, 2000mAh Li-ion battery) that has stopped charging properly. I am being told that the battery on this ...
Foad's user avatar
  • 243
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4 answers
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Is it acceptable to connect a car battery and an AGM battery in parallel?

I power a 12V fridge in my car either via the car battery (when the vehicle is running) or via an AGM battery. There is an Anderson outlet in the car connected to the car battery to which I attach a 3 ...
Guru Josh's user avatar
  • 195