Although one wouldn’t expect battery life while suspended to depend on OS, the state the CPU is put in can affect battery life dramatically in suspend.
If computer appears dead upon RAM upgrade, it might be doing a quiet RAM self-check.
The Lenovo X220 can have a second “slice” battery that snaps onto the bottom, adding nearly 60 Watt-hour to the 86 Watt-hour 9-cell battery.
Lenovo sends repair parts to you if you want to fix your laptop on your own.
Lenovo offers laptops for better specs than Apple, more advanced tech for a fraction of the price.