I have a 2004 mark2 prius.Where can I get technical information relating to battery terminal voltage,methods of paralelling different types of batteries.One company is removing the original toyota battery NiMH and replacing it with lithium ion.Can I purchase the battery that has been removed and put it in paralell with the original battery to increase the capacity.Where can I get information on a suitable battery charger for my batteries. If I decide to build a charger myself ,do I need a full wave rectifier. What tappings will I need on the secondary of my transformer.What current will the secondary need to carry in safety.Thanks for your time. David.