How to Charge your Sutro Battery

It's best practice to keep your second battery charging in the hub at all times.  That way, it's already fully charged when it's time to do a battery and cartridge change.

1. Press on the indent on the top of the hub to open it
2. Place the battery in the battery slot as shown. Make sure that the gold contact line up.
3. Close the lid of the hub
4. The LED will turn red to indicate the battery is charging.
5. Once the battery is fully charged, the LED will change to green.