Nitecore NL166 650mAh Rechargeable Li-ion RCR123A 16340 Battery, Yellow, 6952506490318 from OpticsPlanet, Inc at £9.89. Nitecore NL166 650mAh Rechargeable Li-ion RCR123A 16340 Battery, Yellow, 6952506490318. These batteries by Nitecore are made of lithium ion and useful for powering up your various