Powerowl Charge any number of AA AAA rechargeable batteries to make your charging easier and extend battery lifespan Charging in pairs is bad for battery lifespan in the long run. This is because even if you start with same brand of recharge batteries, there is always some difference in their capacities. When you charge two unequal cells in a pair, the one with lower capacity ends up being over-charged, which further reduces its capacity over time. So your overall battery capacity will deteriorate much faster. Maximize Battery Capacity Trickle charged mode will help maximize the capacity of battery to full Charger Specifications Output: 250mA/Pcs; Input: DC 5V 2A The smart charge function on chargers checks the charging conditions of the batteries, the temperatures of both the batteries and the charger, etc. This allows the charger to individually charge each battery under the best conditions. Powerowl charger can quickly detect damaged batteries. The red indicator light will flash. The red light flashes for more than 15 seconds, please move the non-rechargeable battery in time Repair damaged batteries within 15 seconds. The flashing red light stops flashing. Powerowl patented technology, only the 2021 version of the charger has this function. 16 Pack AA Batteries Rechargeable 8 Pack AA Batteries Rechargeable with Charger 4 Pack AA y 4 Pack AAA Batteries with Charger 20 Pack AA Batteries Rechargeable 24 Pack AAA Batteries Rechargeable 4 Pack AA y 4 Pack AAA Batteries with Charger Add to Cart Add to Cart Add to Cart Add to Cart Add to Cart Add to Cart Customer Reviews 4.4 out of 5 stars 17,681 4.3 out of 5 stars 21,429 4.4 out of 5 stars 2,526 4.3 out of 5 stars 3,810 4.4 out of 5 stars 10,511 4.3 out of 5 stars 21,429 Price $31.99$31.99 $36.99$36.99 $28.99$28.99 $40.99$40.99 $27.99$27.99 $30.99$30.99 Quantity 16 8 Pack AA+Charger 4 Pack AA+4 Pack AAA+Charger 20 24 4 Pack AA+4 Pack AAA+Charger Voltage 1.2V 1.2V 1.2V 1.2V 1.2V 1.2V Rechargeable ✓ ✓ ✓ ✓ ✓ ✓ Material Ni-MH Ni-MH Ni-MH Ni-MH Ni-MH Ni-MH Capacity 2800mAh 2800mAh 2800mAh y 1000mAh 2800mAh 1000mAh 2800mAh y 1000mAh Number of cycles 1200 1200 1200 1200 1200 1200