Dolgin TC400FUJIW2 Four-Position Battery Charger with TDM features four integrated battery plates supporting Fuji NP-W126S and non-OEM batteries. It's capable of charging four batteries simultaneously and charges a typical 1260 mAh battery in about 2.5 hours. As the battery is being charged, a diagnostics LCD displays status in volts, amp hours, and percentage of charge. The percentage of charge is estimated using a proprietary algorithm. A built-in Test/Discharge Module (TDM) allows the user to determine whether the battery is new or old and on par with its label. TDM cycles the battery (fully charges and discharges it) and provides a report on its capacity.