20 Most Recent Becker Traffic Assist 7827 Personal Navigation System - UK Car GPS Receiver Questions & Answers

Assuming you have or are able to extract the old battery, find the model number of the battery and google it. Odds are you'll get multiple replacement options.

Go to http://www.mybecker.com/. Click on the Mobile Navigation link and select your model number. On the specific model # page, there is a Downloads link that gives you the option to download an 'operations guide.'
Hope this helps!

Download the instructions from here: http://www.mybecker.com/uploads/tx_akkordion/Manual_MAP_PILOT_NA_en_US.pdf