I really should know this - but i'm having a brain meltdown.
The LT came with a battery charger - i'm not convinced it's working very well (i don't think it charges very fast). When i put a battery on charge with it the voltage reads 12.5v. (it was 12.9v before i turned it on).
Its supposed to be a heavy duty charger - here's the label:

When i put on my Halfords charger the voltage goes to 13.9 volts - which seems more likely to charge my battery.
Is this expected behavior for a heavier duty battery charger - or is it knackered?
Appreciate the help.
Thanks for looking,
Ringo