 VRLA batteries may be continually float charged at around 2.18-2.27 volts per cell at 25 °C, depending on the type and battery manufacturer specifications.An equalization charge cycle, having a higher voltage low current profile, may be occasionally utilized to partially reverse a battery sulfation condition; some SLA smart battery chargers either manually or automatically perform equalization cycles at infrequent times.Some designs can be fast charged (one hour) at high rates.