Tenergy TN156 4-Bay Compact AA/AAA NiMH LCD Battery Charger Worldwide voltage for 100-240V AC input. Four independent charging channels for individual battery charging and detection. You won't have to charge the batteries in pairs only. Eight hours charging time cut-off to ensure safety. By cutting off the charging after 8 hours, this will lead to better battery life and safer charging. Buy with confidence, your charger includes a 12-month warranty. Constant charging current mode; trickle current when fully charged. Will charge both AA and AAA batteries. Just flip down the notch to open contacts for AAA. Can take both chemistries: NiMH, NiCd.