Sealey bscu25 battery support unit and charger 12v 25a 24v 12 5a sealey bscu25 p this battery support unit and charger from sealey is a high frequency inverter type unit designed to both charge a battery and provide support for the battery during prolonged electronic diagnostic checks charge cycle has 9 profiles designed to optimise the condition of the battery and the speed of the charge it will recover a discharged battery gt 2v to almost 100 of its original capacity p p designed