Approximate charging times
Battery
ACH-3U
ACH-4U
Slim BBH-1S
4.5 hours
1 hour
BBT-1XV Vibrating
4.5 hours
1 hour
Ultra Extended
BBH-2H
9 hours
2 hours
Ultra Extended
BBH-1H
14 hours
2 hours, 30 min.
Note: It is recommended that you allow your battery to
fully discharge before you recharge it. Batteries last
longer and perform better if allowed to discharge fully at
least once a week.