Thank you for paying attention to our UltraFire 3.6/3.7V Charger for 18650/14500/17500/18500/17670 Batteries and More， whichwill be your best assistant to power your device. Coming with secure protection function， our battery charger provides you with stable charging performance， high efficiency and energy conservation. The precise components which make for guaranteed circuit also bring you good stability and greatly extend the service life of your batteries. Compact and portable， our battery charger will be a necessity for daily use!                                    Features            Bring you good stability and greatly extend the service life of your batteriesIt can charge many rechargeable 3.6/3.7V batteriesCompact， portable and easy to carrySafe and efficient use of energyIt provides you with stable charging performance， high efficiency and energy conservation                                                            Specifications            Power Source    100V/220V auto AC switch    <br>Compatible Batteries    3.6V/3.7V 18650， 14500， 18500， 17670， 17500 rechargeable batteries    <br>Output    4.2V， 450mA    <br>Charging Time    2 to 4 hours for 18650 Batteries    <br>Dimensions    (5.11 x 2.36 x 1.18)" / (13 x 6 x 3)cm (L x W x H)    <br>Weight    3.28oz / 93.1g    <br>Color    Black !#!amp!*! Gray    <br>                                                            Package Includes            1 x Battery Charger1 x Power Cord                                                            Extra Info            Note: the horizontal contacts (the ones on the sides) are disabled by Ultrafire for unspecified reasons. kikkoman reported that these disabled contacts can be re-activated by modding the charger (connecting a few soldering points):http://img293.imageshack.us/img293/4606/dsc00081pi1.jpg. Upon re-activation these horizontal contacts can be used to charge CR123A batteries. You may still need to bend the contacts outward by a bit.