How to fix VEX IQ Charger Flashing Light and not charging battery or Dead Battery
A common problem with Vex IQ robot battery is that it will not charge when placed on the charger. The charger light will flash red but not charge. Common cause for this issues is leaving the battery in the brain when robot is not being used. This also applies if you have a battery that doesn't work. Watch this video for how to resolve this issue.