The Watson 4-Bay USB Charger and Portable Power Pack charges 2 or 4 AA or AAA NiMH batteries at a time, and is capable of charging cells of both sizes simultaneously. Charging time ranges from 1.9-2.2 hr for AAAs and 4.3-6.0 hr for AAs. The charger/power pack features a micro-USB input port for charging batteries, as well as a USB 2.0 output with a blue indicator light for charging mobile devices when 4 AA or AAA batteries are installed. When charging mobile devices, the unit can accept either rechargeable or non-rechargeable batteries. LED indicators show charging and output status.
Reverse Polarity Protection safeguards the charger and your batteries against damage when batteries are installed improperly. The integrated AAA chamber adapter simply slides down to reduce the size of the battery slot, allowing you to insert a AAA instead of a AA. A circular hole in the back of the device makes battery removal easy by enabling you to pop the cells out with your fingers. A USB-to-micro-USB cable is included.