Tenergy 12 Pack Centura AA Rechargeable Batteries with TN160 12-Bay Smart Charger - 2800mAh Low Self-Discharge NiMH Batteries for Remote Controls, Toys, Flashlights, Game Controllers & Electronics - Perfect for Home, Office and Emergency Power Backup

Note: Charger was used with AmazonBasics AA NiMH Precharged Rechargeable Batteries-8-Pack, 2000 mAhI purchased this product because my battery costs were out of control in supplying 4 Nikon Speedlights with AA battery power, easily exceeding $30 a month. After much research, I narrowed my selection down to this product and the 16 Slot Titanium AAAAA Fast Battery Charger with LCD Display. However, the latter was out of stock when I went to purchase and thus defaulted to my #2 selection, the Tenergy.The charger comes packaged in a blister pack that has to be cut away. That is the only fault I can find with this charger. The charger is very well built with decent weight to it. Both build quality and materials are very good. Instructions are a little on the light side, but no big deal. The design is simple, which is a major selling point to me. Being able to charge 12 batteries makes my life easier (the Titanium charger can do 16). The charger can easily be transported onsite and will fit in most camera bags and easily into luggage. Despite the 12 battery design, it does not take up much space.I immediately loaded up the charger with 12 AmazonBasics AA NiMH Precharged Rechargeable Batteries-8-Pack, 2000 mAh. The charger took about 3 seconds to read each battery and display current state status. It then began charging them simultaneously, taking about 4 hours to bring them all up to full charge. Batteries that were in process of being charged became a little warm (in no way hot) during charge cycle. Once fully charged, I could not detect any heat and the charged batteries were cold to the touch even though they continued to receive a trickle charge to maintain the charged state. The display continuously displays battery status. The digital display is very bright (blue), but easy to read.Charge time rates from package:700mAh AAA 1.8 hours900mAh AAA 2.3 hours1500mAh AA 3.9 hours1600mAh AA 4.2 hours1800mAh AA 4.6 hours2000mAh AA 5.2 hours2300mAh AA 6.0 hoursIn summation, I am very impressed with this product, especially at the price. I was prepared to spend twice the amount. Apparently, I did not need to. As a side note, I ordered another charger.TIP: I recommend you number or letter your batteries in groups if using them in pairs, especially for photographers using flash. This will allow better battery management and pairing. Also, the batteries should arrive at end of life cycle more or less at the same time- avoiding mixing new batteries and old.