OTC 3386 Antizap Auto Surge Protector - 12 V

this is a fairly common eb style jump starter pack with the lithium cells inside it and it's a type that uses the standard leads which i've ordered to take one of these apart and this was given to me by a local chap called Andy hood but a while back and used a couple of times and then it just kind of stopped working so I'm the secretary when you put it into charge when you plug a USB lead in a kind of starts trying to charge but when you press that it's kind of a hex very randomly when you press the button the side to actually activate it you can fill the button clicking and I've tried shorting it out and trying to trace it back but it's just not responding to the button at all however it's interesting a look at the circuitry now you might wonder what set of protection is in these huge protector from over current and over discharging of ourselves and the answer is none not that I can se