Mex, do any/all the components of your testing method(s):
1) If done when a battery is new and then repeated periodically as it's used - indicate about when the battery is ready for replacement?
AND
2) Lend themselves to portability for carrying along with you on an RV trip?
AND
3) Lend themselves to being done without removing/disconnecting the battery(ies) from the RV's 12V system?
Remember the/my goal here ... monitor an RV battery in real time using a built-in system quickly and inexpensively on RV trips so as to indicate BOTH -> when it needs recharging and when it needs replacing.
Perhaps the "when to replace" goal is an impossible one ... but I can't help wondering if modern hybrid vehicles don't contain some built-in way of notifying their owners when their lithium battery banks should be replaced. I'll bet they do and if so ... why can't something be done to provide the same capability for the users of good old lead acid RV batteries.
