I have a Partner II R3.1 Processor that no longer holds it's programming. Are the memory batteries easy to chnage out or is it just better to just replace the whole Processor?

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Oh Lord, Thy Sea is SO Great
& my boat is SO small.

I've replaced them. Not bad but you need to pull the entire processor apart. I tend to sell them a refurbished unit from a company that I know replaces the batteries. Then I replace theirs and keep it for a spare next time. Seems like I've had OK luck using 3.6 volt cordless phone batteries.

theres a company called refurb supplies .com i think thats it that has your battery on its web site
i do the same as suggested above get one replac e battery on old and keep a spare

You can do it yourself. I usually do a couple a year. Crack the processor open, and remove/replace the battery. We usually replace with one from Battries Plus.