Emergency Fuel Cell Battery - MgBOX | Portable and Lightweight

The MgBOX is a small and portable emergency magnesium (Mg) air battery developed by Furukawa Battery Co., Ltd. of Japan. It was originally developed as an emergency battery for use on land but is now available for use on ships. The battery is activated and begins generating electricity after fresh or salt water is added.

MgBOX Emergecy Fuel CellMgBOX Emergency Air Battery from Furukawa Battery The MgBOX can be stored for long periods and is activated by simply adding fresh or salt water. Once activated, an MgBOX will provide a source of electricity for up to five days via a USB adaptor box or hub. Devices that can be connected to the USB adaptor box include small lights, mobile phones and smartphones. The USB adaptor box is included inside the MgBOX and can also be used to recharge small portable devices multiple times.

MgBOX Specifications
Power generation time 5 days (maximum) 
Rating 300 Wh
Dimensions 233 x 226 x 226 mm (W x D x H)
Weight About 1.6 kg (before filling) 3.6 kg (after filling)
Adaptor USB box/hub with 2 output ports
Output Voltage DC 5V
Maximum current 1.2A per USB port

On a ship, multiple MgBOX units could be stored in various locations including the wheelhouse, engine control room (ECR), crew accommodation areas & areas where passengers may gather during an emergency. Before adding water, the MgBOX weighs only 1.6 kg and therefore it can be stored in a variety of locations including on shelves and then moved easily to where it is needed.


Simplified Usage Instructions

MgBOX Instructions

Please also refer to the detailed instructions and warnings supplied with the MgBOX.

For further information please use our online Contact Form

For information about other batteries available for ships and marine use please see: Batteries and Energy Storage


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