PD150 menu settings keep resetting!

ive had a PD150 for a while and its just started resetting all the menu settings ever time its turned off and on again... is there an internal battery i need to replace or something? or is this the sign of nastier problems coming?

help!
 
i guess that means nobody knows.... its a strange thing and i dont know why its happening (although im hoping its me being an idiot and is something really simple to fix)
 
Yes, it is the internal battery. It is located inside the handle. I am pretty sure the battery type is a BT801, and costs around $15.
 
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