I use one of the cheap HF ones in the Cherokee. I have a pretty significant electrical draw that will kill the battery if it sits for 2 weeks.
With the solar trickle charger, it was able to sit 2 weeks and start under it's own power. The battery was still pretty low and it cranked slow, but it did start under it's own power. Usually after sitting 2 or 3 weeks, I would have to pull the battery and throw it on the charger (I don't own any jumper cables)
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