Works great. Installed into an older Tamiya buggy and it brought that old buggy to life! Lots of power available for bashing around. Provides 40+ minutes of flogging without even getting warm. It is a snug fit in the chassis but it does slide in where that old Nicad used to sit (without modification), so that is a big plus. I also have the hard case 5000mah version but that is too big for a Nicad replacement. Will buy more of this one when the need arrises.