Battery Charger Fast ChargingNoteExtremely fast charge rate increases heat which in turn reduces battery life in the long run.TN157 is tuned for an optimal fast rate that still preserves & maintains long battery life, which lets you use your batteries for more cycles. Compatible with any NiMH or NiCD AAA/AA Battery Brands8 Charging Slotscapable of charging 1-8 batteries at a time; great for users with a lot of batteries Independent Channels with individual LED Display - no requirement to charge in pairs like less expensive chargersLED Indicator for proper charge, discharge & trickle charge (see table below)Intelligent microprocessor controlledWith negative delta V cut-off function -- for automated chargingNi-MH batteries can be mixed to charge at the same time Press and hold refresh button to start/stop refresh batteries Temperature sensors to avoid the battery from being damaged by over-heating (Max55C)Mechanical & electrical protection against wrong/reverse polarityMaximum charging timer control (8 hours) for overcharge protectionShort circuit protectionBad battery or Alkaline battery detectionCharger InputDC12V 1000mACharger OutputDC 1.2V AA 500mA x 8 AAA 300mA x8 Applicable battery type1.