I have a xs power hf1215 charger am I able to do it with that? I haven't charged it since I posted this just been sittin in my appartment so it can have a rest voltage and reads between 12.4 n 12.5. By the way I wanted to buy a xs power d1200 for under the hood since the d3100 didnt fit in there, also a xp3000 battery and parallel them is it possible.