Lenovo is quite good at supporting their products, as manufacturers go, so you might still be able to find an OEM pack that is not too stale. Past that, I thin

Lenovo is quite good at supporting their products, as manufacturers go, so you might still be able to find an OEM pack that is not too stale. Past that, I think the next best answer is you crack open the pack and you replace the cells yourself. The aftermarket packs are total garbage.