I found that the voltage does not say much, at least not for a general type. Just put your multimeter in 20 A mode and make sure you connect the red cable to A

I found that the voltage does not say much, at least not for a general type. Just put your multimeter in 20 A mode and make sure you connect the red cable to A terminal. Use it to shortly short circuit the batt. A good (charged) battery delivers >8A