Battery load test is a good place to start, and given what we've seen on this thread and elsewhere, there is a good chance that four years of less than ideal charging has killed the batteries.
Better battery life requires really good charging technology and usage habits. Or, go the KISS route and keep the original system, go camping and be happy. You just have to get used to buying batteries every couple of years as a cost of ownership. ;-)
Better battery life requires really good charging technology and usage habits. Or, go the KISS route and keep the original system, go camping and be happy. You just have to get used to buying batteries every couple of years as a cost of ownership. ;-)