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@rachel_norfolk I plug it in and use it to stop the battery going flat.

If I’m very lucky, it will last 3 months before it starts doing the “bing bing bing” of death.

At that point, it cannot be salvaged and the only thing is to throw it away and get a new one. Even if you clean the gunk off, there is hardly any copper left underneath and it is in a death spiral.