link to buy https://www.harborfreight.com/20v12v-dual-... HERCULES 20V/12V Dual Voltage, Fan Cooled Lithium-Ion Battery Charger SPECIFICATIONS SKU(s)58922 Charge time 12V: 30 min. (2.0 Ah battery), 35 min. (4.0 Ah battery), 20V: 40 min. (2.5 Ah battery), 48 min. (4.0 Ah battery), 75 min. (8.0 Ah battery), 105 min. (12 Ah battery)