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Fellow Geezer here, so limited opinions vs the younger/still mechanically inclined fellow posters...
Batt R&R is a PIA, but not impossible. It requires getting to batt and a long pair of arms. Maybe do it in a cool/shady indoor spot?
I have done a batt R&R a few times on our 2001 E53, and it is probably due for a new one. I have had v good luck with sealed AMG type batts from Battery+ or AutoZone, over the last 23 yrs.
I would skip the task of 'How is my current battery doing' and just get a new sealed batt of proper rating/size/physical size and R&R it, or have a shop do it...our year(s) do not require any 'coding' or matching like new X5s do.
I do a low amp Battery Tender on newly purchased batt for a day or so, when I get them home to bring them up to full easy charge, before installing, fwiw.
Key: I have lost one of the orig/OEM fob & key, but I passed on the side bar versions and spent the ~ $250 at a BMW dlr for a new 'real' version. Easy and quick and they work without fiddling, and they did the 'coding' or key synch for me for at that price. Was worth it for me vs fiddling..
My 50Cts...
GL, mD
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