Early Boxsters (up to about 2002) had an eight-ball metric sized lighter and receptacle that does exactly what he is describing. Changing it over to the later lighter kit will permanently solve his problems.
Some maintainers are fully capable of recharging a dead battery (assuming the battery is capable of being charged), but they are usually the more expensive and highly featured units.......
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“Anything really new is invented only in one’s youth. Later, one becomes more experienced, more famous – and more stupid.” - Albert Einstein
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