[frizzen]

Thinks or Things?

Dual cell: Run two batteries in the car.

Good things: More voltage, fairly easy to do, cheap speed, lets you take stock cars in races.

Bad things: More weight, needs special charger, changes CG and roll center.

Good entry level performance mod, pretty hard to mess up.
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This has been far surpassed by switching to MosFETs instead of the normal SMT transistors. But you've either gotta know what you're doing, or send off a car and cash to somebody that does.