Flashlight

Battery Types

Standard batteries:

• CR123A battery - 17mm x 34.5mm - 3v
• AA battery - 13.5–14.5mm x 50.5mm - 1.5v
• AAA battery - 10.5mm x 44.5mm - 1.5v

Lithium batteries:

• RCR123A battery - 17mm x 34.5mm - 3.7v - 750 mAh
• 10180 battery - 10mm x 18mm - 1/3 AAA size
• 10280 battery - 10mm x 28mm - 1/2 AAA size
• 10440 battery - 10mm x 44mm - 3.6v - 320 mAh - AAA size
• 14250 battery - 14mm x 25mm - 1/2 AA size
• 14500 battery - 14mm x 50mm - 3.7v - 800-900 mAh - AA size
• 16340 battery - 16mm x 34mm - 3.6v - 880-1000 mAh - Nominal CR123a size)
• 17335 battery - 17mm x 35mm - 3v - 1000mAh - Nominal CR123a size
• 17500 battery - 17mm x 50mm - 3.6v - 1300 mAh - Slightly wider than CR-123, fits most lights, but 1.5 times the height of the typical CR-123a battery - two of these will generally replace three of the CR-123a batteries
• 17670 battery - 17mm x 67mm - 3.7v - 1800 mAh - About the size of two CR-123a batteries, but less overall voltage, 4.2v max vs. 6v max from two primary batteries
• 18500 battery - 18mm x 50mm - 3.7v - 1300-1500 mAh - Wider than CR-123a, about 1.5 times the height of a single CR-123a battery, these will only fit lights designed for their wider size
• 18650 battery - 18mm x 65mm - 3.6v-3.7v - 1800-2200-2500 mAh - Wider than CR-123a, about 2x the height of a single CR-123a battery, these will only fit lights designed for them

References

• List of battery sizes
• Rechargeable Lithium Battery Information
• AW's LiIon Batteries Sales Thread