These 1.2 amp battery charger / maintainers are down to £20 now... I have bought 3 - one fitted to sister-in-laws car with SAE plug accessible at bottom of front grille and a lead out through hole in porch with 12 foot extension cable, initially charged the almost flat 65a/h battery - been using it for over a month now ( does not use her car much and the alarm standby current keeps draining the battery ). Fitted one in the garage for my SV - does a soft start charge ramps up from about 12.7 to over 14 volts and samples battery voltage, the 'float voltage' is controlled by a temperature sensor in the unit, I checked it on SV and when green light came on it steadied at 13.7 volts, which is spot on for the 5degC temp in garage at the time ( the lower the temp the higher the 'float ' voltage ).. My brother has one as well on his VFR 800.
https://batteryuniversity.com/index....w_temperatures
https://www.amazon.co.uk/gp/product/...?ie=UTF8&psc=1
This contains a permanent fuse lead with SAE lead and a lead with crocodile clips
You have over 1.8 metres from 13amp plug to charger and then 1.5 metres from charger to end of 12volt lead SAE plug, the fuse lead supplied o fit to battery is about 500mm long.
and also got an extra an extension lead
https://www.amazon.co.uk/gp/product/...?ie=UTF8&psc=1