This rechargeable RCR123A battery provides a high capacity of 900mAh, and can serve as a replacement battery for several applications and devices. The Li-Ion cell provides up to 500 charge cycles. This will save you time and money of constantly rebuying disposable batteries each time you run out. With a low self-discharge technology, your batteries can sit for years and still be ready when you need power. Some rechargeable batteries permanently lose capacity after long-term storage, resulting in reduced runtime.