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I had a battery tender brand die in a year or two. Bought a couple really cheap black and decker battery maintainers They were 20$ at the time but I see they are 30 now. Anyways they have both worked fine in continual use for about 5 years.
They wont charge a super dead battery though, need an old school charger like you have, or a 12v power supply to get them up to a few volts state of charge.
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84 930
18 Cayman GTS
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