The Battery for the BLHX,BLX,BDHX,BDHX,and PDHX originally was a three pronged PCB mounted battery. Since the battery is soldered directly to the PCB board replacement of the battery is not recommended in the field, but under certain circumstances custmers can replace the battery if they have experience soldering PCB's. Please note that opening the cover voids the warranty of your product. The original battery was Nickel-Cadmium (NiCd)3.6V 110 mAh. The original manufacturer, Varta Battery, has since discontinued this battery which had the part number 3/V110H. It has a drop in replacement battery that is a Nickel Metal Hydride (NiMH) 3.6V 150mAh, which has the part number 3/V150H.
For units out of warranty Compumotor recommends the following vendors this battery.
RS Components Ltd.
http://www.rs-components.com or http://www.rswww.com
NN17 9RS Birchington Road
Corby, Northants UK
Phone from the US is 011-44-1536-201201
Farnell International Distribution Centre
http://uk1.farnell.com or http://www.farnell.com
Maybrook Industrial Estate
Phone from the US is 011-44-0870-1200202
Order Code: 279-353
Newark Part# 06WX2748