There are many versions and makes/models of plug and play trolley type systems. We do repairs and maintenance on most of them. Eventually all these units will need battery replacement as the batteries become depleted. Sometimes the units require inverter head replacements as well. Please see options below. If you are not sure what your unit requires, please bring it in for assessment and we can provide a quotation. NB: We do have a minimum charge should you decide not to proceed with any repairs.