Have a older Latitude CPi D300X (new to me thanks to eBay) that will not run on batteries or even acknowledge that one is installed. Dell customer (dis)service told me to go pound sand, out of warranty. I have placed a fully charged battery into the left and right bays and the system still claims that no battery is installed. If anyone has the schematics for this machine, I sure could use the help. Thanks, Craig D.