Quote:
Originally Posted by glend
In my experience, the car jump start units do not last very long. They may handle your load but they designed for high amp output in short bursts and not long sustained deep cycling. If you let them sit they will lose their charge, and once that happens they cannot recover. I won't use them anymore, preferring deep cycle batteries for dark site work. I use a 44ah for mount power and have a 100ah for dew heaters, laptop inverter, camera cooling, etc. Does not take long to recharge next morning with a solar panel, and they have lasted for years with no sign of deteriouration. They are heavy buggers, especially the 100ah, but they last. I must admit they do double duty, at home they sit in the observatory on float.
Read the fine print on thise car jump start packs, most of them have batteries with less than 20ah inside.
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I dunno - the 9AH I still have is going on 8 years now. Seems OK to me. Just cold-sensitive.