You can test a battery if you go under the hood and connect up the right meter to measure the battery integrity but why can’t a modern car employ the technology easily? (Or maybe it does and I need a new car)
In: Engineering
Car batteries don’t tend to have a long and drawn-out death. In general they work normally until one of the plates inside develops a crack, which massively limits the current the battery can develop and stops it from starting the engine.
Since there’s no practical way of detecting this it’s not worth checking.
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