We created a helpful video for connecting (plugging in) the battery, and charging it:Click Here to Watch ItPlease note, different chargers may have one or more lights to indicate what is happening -- i.e. whether a battery is charging or charging has stopped, or battery has been disconnected, etc.  Using the REGULAR Charger:1 - Plug into outlet, LED will be GREEN.2 - Plug into joystick I/O port.3 - LED will turn RED to indicate charging.4 - LED will turn GREEN when completed.Using the SPEEDY Charger:1 - Plug into outlet, LED1 will be RED, indicating it is getting power from wall. LED2 will be GREEN.2 - Plug into joystick I/O port.3 - LED2 will turn RED to indicate charging.4 - LED2 will turn GREEN when completed.We recommend charging your battery regularly.  It is safe to leave the charger plugged in even after the battery has finished charging.  The battery pack is equipped with a Battery Management System will prevent any overcharging from happening, and will turn off the flow of current to the battery cells once a full charge is indicated. You can charge the battery any time, no matter how much charge is remaining in the battery.