Attention! Important information About Your 7.2V Ni-Mg Rechargeable Battery: 1. Do not charge the battery over 5.5 hours as this reduces the lite of the battery 2. Do not leave the battery unattended while caning. 4 When vou feel the sedimentation of the RIC vehicle decrease or stop under normal operational running the R/C vehicle and charge the Rechargeable Battery for no more then 5.8 hours.