10440 TrustFire 600mAH 3.7V Rechargeable Li-Ion Battery + Universal Battery Charger Combo - Single slot Ultra-portable Li-Ion rechargeable & Ni-Mh battery charger Single TrustFire 10440 3.7V 600mAh Li-ion Rechargeable battery Holds 85% charge for over 12months Can also charge 1.2V Ni-MH battery, such as D, C, AA, AAA, 9V