******see my post on page 3 for HP's response to this concern*******
So what gives HP now has two variations of batteries in the stock 16GB TP.
Using Dr. Battery in the preware section verify what the health is of your TP and the Manufacturer rating mAH and calculated left mAH. Also under the device info Tab was is your product number. I think I may have found a trend here. Please see my findings below:
TP 1:New 16 GB battery 6281 part number FB45UT#ABA
TP 2:New 16 GB battery 5647 part number FB355UA#ABA
TP 3 reconditioned: 16 GB battery 5647 part number FB355UA#ABA
updated info below to include battery part number from the box
TP 1:New 16 GB battery 6281 part number FB45UT#ABA; battery hstnh-f29c-s p1967
TP 2:New 16 GB battery 5647 part number FB355UA#ABA; battery hstnh-s29c-s p1967
We maybe onto something battery part #hstnh-f29c-s p1967 may = the higher capacity 6281 battery while and hstnh-s29c-s p1967 is the lower 5647 battery.
So wonder if we have a trend here. I find it odd that there are so many variations on parts for the TP; iPad through FoxConn tend to be standard across the entire production lots which are typically in the millions not thousands like HP. So what gives?