Hopefully someone here can help me. My batteries started dying last summer, they wouldn't charge. I recently picked up all new batteries and installed them. My kids rode the cart around for awhile and the readout said 50% on the charge. I plugged in the HDK onboard battery charger and it doesn't seem to be charging the batteries, 24 hours later no difference in charge. A solid red light on the charger panel which means charging error. Any thoughts or ideas to get me started in the right direction?