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Hi,
I just use a Schumacher which cost maybe $25. It's 6 or 7 years old now and I use it to keep several batteries fresh thorugh the Winter by wiring them in series (removed from the Car). Works great, never killed a Battery. It can also be used in situ, but you have to raise the hood.
Despite their widespread popularity, I am extremely distrustful of the ones which plug into the Lighter socket. If you check the Wiring Schematics, the Lighter Circuit is not directly routed to the Battery. The Juice flows all sorts of places first before reaching the Battery, and all you need is one short in the Wiring Harness and you could Fry the DME or some other mega-expensive component.
I'm probably being over-cautious, but I take the time to connect directly to the Battery, takes only a couple minutes and gives me peace of mind in a sort of Better Safe than Sorry way...
Happy Motoring!... Jim'99
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