As far batteries are concerned, from my perspective, I have to be pragmatic. I have had no axe to grind with the quality of IBM/ Lenovo products at all.
I have a much respected T42 (that may die at any time) and have no access to new OEM batteries for it in the UK (it seems the situation may be the same on mainland Europe). I need to find a reliable third party battery manufacturer, there is no other recourse.
My preferred third party battery manufacturer, Cameron Sino/ CS Technology, does not have a UK/ European supplier, I had to buy my CS mobile 'phone batteries from a supplier in the US. Unfortunately, that supplier does not deal in laptop/ netbook batteries.
For many "legacy" ThinkPad owners in some areas of the Globe, the only way is "knock off" (third party).
The chore is finding a supplier of non- OEM batteries that is/are reliable rather than being up to OEM spec.
I've used laptops since the days when they only came in Vanilla plastic and had NiCad batteries (impressive longevity on those old battery packs, if properly managed).
I paid £166 for my used P8400 model X200 and I love it to bits (much like my T42), but spending £142 on a battery for it from Lenovo would seem imprudent, IMO.
I hope that the CMP range of batteries is capable of fulfilling the needs of devotees of older ThinkPads that can't find new OEM batteries, or can't find them at a price that makes economical sense.
I hope to report back after some months, but a reminder might be useful.
We older, retired people often become bound up in our children and grand kids, at the cost of what has become a hobby, rather than a duty.