I have an Oldham GT Single Lamp Charger for sale. It is microprocessor controlled and they cost about £95 new. Mine is 4-5 years old. Once charged it automatically changes to float charge so that the battery is not damaged if left on charge for long periods of time. It is switchable between 230 V and 115 V if required.
It will be supplied with instructions.
If anyone is interested please PM me.
Thanks
Jon