Provided that a 2 mm length difference can be accommodated, the RCR123A rechargeable Li-Ion 3V battery is a full replacement for the non-rechargeable 3V photo battery of the CR123A form factor with 3.0 volts (not suitable for 3.6 to 4.2 volts). A built-in Li-Ion battery with a nominal voltage of 3.6V to 3.7V is regulated down to 3.0 volts through electronics in the form of a PCB, ensuring that the battery outputs only 3.0 volts. The widely used CR123A design based on Li-Ion technology revolutionizes mobile power supply for many applications. The 3.0V RCR123A battery, based on Li-Ion technology, has a capacity of 2580 mWh and 880 mAh. The Keeppower RCR123A battery can replace the following non-rechargeable 3V batteries: CR123 A, CR123 R, R-CR123, CR17335, CR17345, DL123A, EL123AP, K123LA, L123A. Its height and diameter are larger than those of a standard CR123A battery without PCB and USB charging capability. Please also pay attention to the 3V voltage! The stable and high output voltage makes the 3-volt lithium-ion batteries compatible with all devices optimized for use with disposable batteries. Due to the high voltage, many devices experience increased performance; for example, many flashlights or string lights are brighter, or motors (toys, kitchen appliances) run faster than with non-rechargeable batteries. The Keeppower RCR123A can replace the CR123A 3V battery. Please check the dimensions of the cell before purchasing! Due to the built-in electronics, the cell is not suitable for every application! Its height and diameter are larger than those of a standard CR123A battery without PCB and USB charging capability (delivery does not include the required charging cable).