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
Even a bad battery can show you 12v. But as soon as a load is present, drop to 8v.
When you test the battery in the shop, a big load is put on, for example some heating coils (inside the tester). It should be hard to automate this and not overstrain the battery.
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