Does anyone have experience with charging auxiliary gel cell batteries while riding? I want to operate my amateur radio station while camping and will need to bring some gel cell batteries to run my transceiver while in camp. I can always recharge the batteries using a PV array (unreliable at best), but I was wondering if anyone had experience charging additional batteries from the alternator. I am looking at a 12VDC at ~14A battery. Specifically, can the charging system charge that additional load?