They vary enormously. Barreti probably has an decent optimate charger. I had a battery conditioner which was great for keeping it in trim but very slow to charge if allowed to go flat, maybe two or three days.
Thanks. I've never used it myself, but I'm just vever getting round to driving her enough. The battery's at the stage where it's clicking but not engaging and turning over. It's a new battery, so no probs there.