Beware some of the original i-cybie battery chargers would over charge the batteries if left plugged in and unattended, this would heat up the battery and damage it reducing battery life and would cause it to lose its charge quickly when in use.
To avoid damaging the battery, monitor the battery while being charged. If it starts to feel warm disconnect the charger.
The i-cybie manual says to charge the battery pack the first time for 10 hours and then 4 to 6 hours after that. IF YOU FOLLOW THIS INSTRUCTION THE BATTERY PACK WILL BE DAMAGED.