I have a pride go chair that is only one year old. I USE IT INSIDE MY HOUSE ONLY A COUPLE OF TIMES A DAY AND CHARGE THE BATTERIES EVERY NIGHT. The off board charger has already been replaced once under warranty. Isn't it too new for batteries to go bad? or is it just a lemon???

The small batteries (17 Amp hour I believe) are notorious for lasting a year and often much less. I consistently replace the original OEM batteries supplied with this chair at the 6 month point. The manufacturer warrants these sealed gel lead acid batteries for only 6 months. Try the AGM (advanced glass mat ) batteries and you should get better life out of them. They might be more expensive at retail pricing but your insurance should pay for the better batteries in my experience. Make sure the charger replaced under warranty is the correct amperage for these small batteries otherwise the output could burn the battery plates.