Thanks for the compliment Larry (I try to be always right about what I say- and if I don't know, I find out before saying anything)
I have to say I'm uncertain how the battery age may effect the chip's ability to correct track ink levels, but know older chip batteries can cause problems such as cartridge recognition errors and not resetting ink levels, so assume all chip functions can be effected by old batteries (just like old batteries in an analog clock can make it slower, therefore making the time off).
My (personal) normal practice is to visually check cartridge ink levels before I start printing for the day. I first open the Status Monitor to see what the ink levels are reading, then physically remove and check carts- comparing to the SM, and refilling any that are about 1/4 or lower (then resetting so they read full in the printer). I shake ink carts every week or two, then wait a few minutes after reinstalling the carts (to let froth settle), before printing a nozzle check and starting to print images.
Please keep me posted if you continue having problems with ink levels not reading correctly.
Best regards and happy printing~ Dana