Dewalt battery

New dewalt pack made from irobot cleaner pack for 510/530 series.
Downtown direct. 3Ah. No manf date or cell make. £3 amazon.
The box it came in, and almost fitted, states the cells are samsung or sony. It also states this is a li-on pack, so little confidence there.
Cells are stamped cbt-sc30mk18 c03
22 x 43mm 
First test with a 1.1A load gave a running time of about 2.5 hours (~2.7Ah), so the cells were pretty well charged.

Bought another irobot battery pack in July 2016. This time a BAKTH 14.4V 4000mAh Replacement NiMH Battery for iRobot Roomba 400 series Vacuum Cleaner at £6.70. No manf date. A bit of charge left.
They are no-name cells inside. Poor spot welding. This replaces the 2Ah AEG pack, which I'm moving to the Wickes drill, which replaces a bunch of AA cells which just don't have the umph.
From fully charged, a constant 1A load was applied and got forgotten about until the battery was down to around 1V. A very gentle recharge was applied for 10 + hours, but whilst the volts rose steadily to 15V set point, the charge current stayed 0.4A (C/10) and even when the volts were reduced to 14.4, current dropped off, then stayed at 0.4A.
A discharge with the dewalt lamp (9V cut off, 0.7A load) gave around 4.5 hours, or 3.15Ah. Not very impressive. Currently on the normal charger; takes about 2h and gets pretty hot.