10440. Common lithium battery models: 14500, 10440, 14650, 17490, 18500, 18650, 26500, among which battery No. 7 corresponds to lithium battery model 10440. AA battery is an American standard of dry battery which is commonly used in electronic products that are smaller and consume less power.
Battery models include 18650 lithium battery, 26650 lithium battery, 14500 lithium battery and 16340 lithium battery.
1. 18650 lithium battery: 18mm in diameter and 65mm in length, it is one of the most commonly used battery models in bright flashlights.
2. 26650 lithium battery: diameter 26mm, length 65mm, 18650 lithium battery has larger capacity and longer life.
3. 14500 lithium battery: 14mm in diameter, 50mm in length, commonly used in small bright flashlights.
4. 16340 lithium battery: 16mm in diameter, 34mm in length, slightly larger than 14500 lithium battery, commonly used in small bright flashlights.