Most of the balance charger can help you avoid over-charge, as long as you set it in a proper way. And you can use the ESC's programing mode to set the LVC to 3.2V volts per cell with a hard cut-off; or 3.4 volts per cell with a soft cut-off. Of course, soft cut-off will be better, and do good to your battery and RC vehicle.
And you can get a balance charger from WtoToy.com , if you needed.