These chargers are specifically designed for specialty litium-ion batteries including the RCR123A and the 18500. Some caution must be exercised as these cells are naturally 3.6V, not 3V as is a standard CR123A. RCR123A cells are typically about 1mm longer than is standard so if you're using 2 in series you need to be aware that they'll be 2mm longer in total - this is not a problem for most devices as most devices use a spring contact for just this reason. All the cells on this page are 'protected' cells that use a PCB to prevent over-discharging, short circuit, etc - please read the specific item descriptions carefully for full details. These chargers include their compatible batteries and are built by some of the most trusted names in the industry.