one with 6.1V was probably good?
anyway with ECO light coming at 50% - changing one cell to good will get you at around ECO coming at 20-30% so still not perfect.... still I think one or two battery will need replace - the question is which one
![Wink ;)](./images/smilies/icon_wink.gif)
it is good idea to put 100% OK batteries in 11-pack to not have to remove it again... and to findout the others packs which are way easier to remove.
I've learned from Germans
![Wink ;)](./images/smilies/icon_wink.gif)
![Wink ;)](./images/smilies/icon_wink.gif)