>> Be aware that some of these cheap clones cannot deal with seriously discharged batteries. You need to get the volts up using an old style non electronic charger first.
I think this applies to most, if not all trickle chargers, even some of the CTEC ones.
When LIDL previously started selling similar ones to these a few years ago, customers were returning them complaining they didn't work. Had they RTFM, they would have realised why. They are not a battery charger as such. They are for maintaining a battery that isn't used very much to help prevent it from going flat.
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