i would recomend t thunder tiger tp610c ac/dc....good all in one charger does lipo/lion/nicad/nemi and lead batts..decent charge rate inclues a power supply cord.many chargers dont..yuo can run it with 110 at home and off a 12 car batt outside the house..i use a mix..i have nicad 7.4v car sticks for my 2 fishing boats..my 2 subs run lipo's .. my friend at work does cars/trucks and hydro boats.. he keeps like 4 sets of batts per car but he races at his club..look at the mha..would be like 7.4v 1200mha....for longer run times you need more mha..so you would look to see if you could get a 7.4v 5000 mha batt to run 3 times longer than the 1200mha