Please note that the battery's capacity will decrease over time; this is normal, and it is not covered by warranty.
Check that the battery is fully charged; plug a charger into your Robot until the battery LED turns from green to flashing yellow. If possible, try with another charger. If this doesn't work, discharge the Robot's battery completely until it turns OFF, and then charge the battery again until it is full (""power cycle"" the battery).
If you feel that the battery is abnormally low, please contact the Customer Care.
Please note that the battery is only warranted for a year, regardless of whether you have purchased an extended warranty or not.