easy 4.9 volt mod

[Richie-from-brooklyn]

I did this and it worked great, put aluminum foil in the middle battery holder and use one 3.7 volt battery lithium ion and one 1.2 volt nimh. the car runs faster than 3 alkaline batteries and much much longer with strong power.

[Dash cohen]

I smell smoke in your future, mixing voltages and and types will cause thermal runaway, and they will catch fire,
B
http://realfxandhotwheels.blogspot.com/