WJChriss if you could rewire your two battery packs in parallel you'll get two major benefits. The first you won't drain your batteries as much on the way over. While you are at work they will be at a higher voltage. Lead acid batteries like to be recharged as soon as they are used. Having one completely drained for the day until you get back is not good for it. Once back home when the batteries are at there lowest voltage you can immediately recharge them both with one charger if they are connected in parallel. I plug mine for the night and leave the next morning. My starting voltage is usually 27.3 and around 23.8 to 24.1 when back. I commute 30km - 20 miles to 46km - 30 miles if I need to make a detour to an alternate bridge.