Even if the batteries are new , if they have been sitting around for a decade unused they will expire on the shelf.
Most of my laptops are Thinkpads except for a handful and 5 of those are Wallstreets. I have old OEM batteries that still have a decent charge (3 of the 5 Wallstreets have usable batteries), plus a whole bunch of IBM OEM batteries dating back to the later 90's that still work. But I also have much newer BTI and other 3rd party batteries that are much newer are are totally dead. 3rd party batteries seem to be junk, even if they work when new they do not seem to last as long as the original designs. Do 3rd parties use cells that are cheaper because they didn't pass OEM specs and are second tier parts (kind of like BASF paint that didn't pass OEM QC and ended up at Earl Schives paint booths)?
Most of my laptops are Thinkpads except for a handful and 5 of those are Wallstreets. I have old OEM batteries that still have a decent charge (3 of the 5 Wallstreets have usable batteries), plus a whole bunch of IBM OEM batteries dating back to the later 90's that still work. But I also have much newer BTI and other 3rd party batteries that are much newer are are totally dead. 3rd party batteries seem to be junk, even if they work when new they do not seem to last as long as the original designs. Do 3rd parties use cells that are cheaper because they didn't pass OEM specs and are second tier parts (kind of like BASF paint that didn't pass OEM QC and ended up at Earl Schives paint booths)?