As a backup thing, it will go to a sagging battery, plus you can charge gadgets. But with a really dead battery, less than 8 volts will no longer help. On gasoline engines, of course, this thing is much easier, I lit a neighbor's cigarette, started up with a half kick. Has pros: A two-liter diesel engine, it starts with a slightly sagging battery, we can’t replace it if the battery is not very dead, it’s convenient to connect, it’s made qualitatively. Its cons: A battery that has run down to 7-8 volts will not revive, although they wrote here that even with a discharged 0 it will help. these are all fairy tales, I tried it several times and with a special mode, the starter does not even turn.
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