UltraFire WF-139 Battery Charger, 2-Slot, input AC 100~240V 50/60Hz or DC 12V 400mAh, output DC 4.2V 450mAh(or 225mA each when charging 2 batteries together), fits 18650/18500/17670/17500/14500 lithium batteries.

This is a high-performance mobile battery pack for the ULTRAFIRE WF-139, guaranteed to meet or exceed the OEM specifications of your original. The mobile battery pack is 5.25 x 2.5 x 1.12 inches. Manufactured by Empire Scientific, model number FBC-WF-139. We offer a 1 Year Warranty with purchase. See this product elsewhere at a lower price? Call or email us; we have a Price Match Guarantee.