XTAR Rechargeable Lithium-Ion AAA Battery Next-Gen Rechargeable AAA ~ Reusable 1200+ Times. XTAR''s 1620mWh Li-ion AAA Battery is a breakthrough for rechargeable lithium batteries, which you can now use in everyday applications. The cell''s 1.5-Volt design and fine-tuned lithium-ion chemistry mean it can be used in place of regular …