The normal charge voltage for a 12 volt battery is 14.4 volts. And the normal charge current is not more than 10%. This device constantly raises the voltage to almost 15 volts. Exceeds the allowable parameter (the battery boils). And the charge current first puts 8 amperes. Which is not very useful for the battery. But for me, it's a tolerable risk. Recovery mode even seems to work. After it, the battery becomes really more cheerful. I've been using this for two years. If you want to have a charger and do not want to delve into the principles of charging - that's it. And the fact that the battery is boiling - unscrewed the plugs and do not worry.
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