The DigiTac Rechargeable features a high quality lithium ion battery. The lithium ion battery provides one of the best energy-to-weight ratios available-important in a compact light like the DigiTac. In addition, lithium ion has solved the problem of the "memory effect" that causes other rechargeable batteries to hold less than optimal charge. Lithium ion batteries hold their charge extremely well, even when not in use, and recharges quickly.
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