The antigravity batteries seem decent although you need a charger that is made to charge lithium batteries. We run a AGM battery in the tq's we have to run a ignition and fuel pump with no charging system. When the batteries get low the ignition will start acting up, in the days of the lead acid batteries a rough track would crack a plate and cause all kinds of havoc! I know Literal racing in Fortville stocks the antigravity batteries, they've gotten popular with the tq guys.