I use powerowl aa Batts for my hp 2's & my senior scanner 396T (still kicks Azz)
1.2 volt hr6 2800 mah
About a 6/7 hr run time on full
They work great, about a 2 hr charge from low on a tenergy super universal ni-mh charger modelT-9688
Have had to replace very few over the yrs
Those Powerowl "2800" mAh AAs don't have a capacity of 2800 mAh, they likely have a maximum capacity of around 2500 mAh.
Chinese manufacturers regularly inflate the capacity of their batteries relying on the fact that most users do not possess a smart charger which can evaluate the actual capacity via a discharge cycle.
EBL also list some of their AAs at 2800 mAh, in reality they're 2500 mAh. EBL list D cells supposedly rated at 10,000 mAh. I needed a set of D cells for an LED lantern and wanted a set of the Amazon Basics brand batteries. Since they were out of stock at the time I purchased 4 EBL cells and evaluated their capacity in my Powerex C9000Pro Charger-Analyzer. I determined their actual capacity to be around 7,500 mAh, a full 25% below the listed rating.
When the Amazon Basics Brand D cells (rated at 10,000 mAh) were back in stock I purchased a set of four. Using my Powerex charger I determined their capacity to be around 11,500 mAh. Amazon was actually significantly underrating the capacity of these D cells. I've found this to be the case with their other NiMH cells too. The Amazon Basics brand NiMH batteries are a good choice, alongside the Eneloops, they're also cheaper.
Current technology only allows a maximum capacity for AA cells of 2700 mAh, and the only manufacturer I'm aware of producing AAs that are accurately rated for this are the Powerex Pro AAs, which are made in Japan and more expensive than other AA cells (Eneloop cells are also manufactured at the same Japanese plant).
Be very skeptical of manufacturers claims of their NiMH cells' capacity, if it sounds too good to be true, it probably is...