DescriptionsWith adjustable electrode,this single slot portable battery charger can charge many types of batteries.This lithium polymer battery charger contains current and Vmax detection program to prevent your batteries from overcharging.Using a usb port to charge,you can charge you batteries in the office using your computer or use a battery bank to charge while you on metro.When you load the battery reverse or load a short-circuited,the battery chager won't work,keep you from possible danger.Small size and light weight,the 18650 single slot battery charger can be put in your bag,pant pocket.FeaturesNo memory effectEnvironmentally friendly100% Brand NewBattery Type: 18650 Rechargeable Battery(not included)Over charge and discharge protection circuitColor: BlackCharge Plug: USB PortPackage Content1 x USB Single Slot ChargerNoteThere might be a bit color distortions due to different computer resolutions.There might be a slight errors due to different hand measurement.Don't not use on outdoor and humid condition.If it is not charged, it may be that the battery is full, aging, short-circuited, reversed,loaded in a normal battery,and electrode is dirty.