>>The laptop is 9 years old. A new battery should be delivered today. I can't wait to test it.

I'd advise some care with batteries for an older PC, especially if from a non-vendor source. I had my favorite old faithful HP notebook destroyed by a battery found on eBay that turned out to be a manufacturer reject because its charge meter always alleges nearly full, even when nearly empty. All appeared fine until one day I used the machine a little too long and drained the battery. Usually the PC would shut down before the battery is completely drained- except this battery was reporting it still had plenty of charge. Anyway, the notebook began to flick off and on rapidly, frying video memory and other components. Hence advice to take some care with older PCs whose batteries would have exited official inventory a long time ago...