Asked — Edited
Resolved by Rich!
The red light is on but the green light is not when I connect to the charger to the roli battery, but when I turn the robot on it says its battery is low.
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Sometimes I have to plug in and remove the balance plug several times, then the green light will start
It can take up to 3 hours to charge, and make sure robot is off.
where did you get the charger from? And how long have you had it for? Maybe you could get a replacement under warrenty if you havn't had it very long, as it does sound faulty.
Can you measure the voltage of the battery? There are a few ways to do that.
1) The balance plug (outside 2 pins)
2) The micro deans connector on the back of the robot (remove the EZ-B to access it)
3) With the EZ-B turned on, across any Vcc (red) and Ground (black) pins.
If the battery has gone under voltage it will refuse to accept a charge. It should not go under voltage since the EZ-B warns of low battery well above the under volt level but it may be worth checking.
same when batt is fully charged wait about 10 min before using the robot.
if you charge direct after you use the robot,the green led will not lid up.
many batts charging the first time takes 10 to 12 houres