We have a total of 4 batteries. We ordered 2 over the past few months, and the other 2 we ordered back in the summer. 2 of the batteries cause our cortex to short out. We knew this was happening a few months back, but I did not remember to bring it to your attention.
We have fully charged each battery, then stick it on the robot. It turns on, but if we bump the battery, or the robot hits something a little to hard, the battery shorts out everything on the cortex causing our limited connection to fail. We think the connection on the batteries are shot. The other two batteries work fine.
Will we have to buy new battery's (this is what I am assuming), or will you replace them?
These are the batteries: http://www.vexrobotics.com/products/accessories/power/276-1491.html[/url]
We are also using the [URL="http://www.vexrobotics.com/products/accessories/power/smart-charger.html"]Smart Charger w/Optional Power Cord to charge the batteries.