How long should it take to charge a motorcycle battery?

Stick the little 9Ah battery off the Super-Dream on that charger and it will take 2.25 hours to completely charge from flat, at 4A, or 1 hour 7 minutes to boil the acid at 8A..... put it on a 250mA motorcycle 'trickle charger' and we are up to 36Hr from completely flat. read more

The 65Ah battery in my car, will take 18.5 hours to charge. On my bike battery charger at 6Amps from completely flat, it will take 11.25 hours to charge 9ah battery. read more

You should be able to charge a motorcycle battery overnight with a 2 amp charger. A bigger charger is not necessarily a good idea - you can damage a battery with too much charge. A trickle charger is great for keeping a charged battery charged, but not enough power to charge a dead battery. read more