Hi, I would like some advice about upgrading my Ford Focus conversion from lead acid batteries to Lithium and a BMS. What batteries, and BMS, how much and how many? Where can I get everything. I want to increase my mileage so I can travel at highway speed to nearby towns- 15 to 20 miles away. The lead acid batteries are just too heavy and old and won't make it. Need to recycle the batteries and upgrade my system. Any suggestions would be very helpful.