Oh well. I put a hard drive in there anyway...
I currently have the original 9-cell main battery from 2012 and it still holds more than 50% design capacity (recalibrated pretty recently) so I don't think it's worth replacing yet.
My main concern is sourcing. I can look up specs and compatibility but I don't know what sellers are safe to buy from.
The 28++ slice battery isn't currently available in the USA store at shop.lenovo.com.
My next concern is performance (capacity x cycle life) per dollar. Where to find something that still holds a decent fraction of the nominal capacity (94Wh) and won't degrade excessively in a few months of normal use?
Even if Lenovo has it back in stock, I would be concerned about their quality having seemingly gone down. More recent reviews of the available main battery (70++ 9-cell) said theirs soon lost their ability to hold a charge.http://shop.lenovo.com/SEUILibrary/cont ... de=0A36303