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LucidMomentum, the charger recommended by Rob is also a battery conditioner. I would recommend getting one just for conditioning and keeping your batteries in good shape. It automatically shuts off when the charging battery gets below 13 volts, so it won't drain your starting battery. If you don't already have an OBD2 extension cable with power switch, get one, so you can turn off the OFT and prevent draining your battery.