I am new to the group, so thank you for this great community. I am a student and "DIYer" and like to repair simple electronics.

Anyway, so here is my situation: Want to repair my laptop battery as there are no more spare being built (Thank you Lenovo) and cracking open the cover of my pack to identify the cells I have these inside: Panasonic NCR18650b MH12210.

Now according to may pack label, I have 10.8 v 72WH 6700 mah, meaning each cell around 1116.6 mah. But looking online the cell is rated at 3200 - 3400 mah!!

Could someone please let me know if there are variation to this cell? meaning there is 1100 mah version of it? I could not find it. Or other cells I can use instead.

I have attached some images of the battery pack and cells.

Any help / suggestion would be appreciated


Battery pavk Panasonic NCR18650b MH12210


Your battery has 6 cells in a series/parallel combination something like this:


simulate this circuit – Schematic created using CircuitLab

Each cell is 3350mAh, so 2 in parallel add up to 6700mAh.
3 pairs in series then give you 10.8V.

  • \$\begingroup\$ Hi, thank you for your reply and explanation. That's great. So is it possible to use higher mah battery? Am I right to assume W=VI, so more ah more power? \$\endgroup\$
    – Maverick
    Jan 5 '18 at 20:02
  • \$\begingroup\$ There are no higher mah batteries, outside of the F1L or GA cells (and they're more expensive for a trivial gain). \$\endgroup\$ Jan 5 '18 at 20:23
  • \$\begingroup\$ Alright, thank you very much. Do you have any tips or suggestions on replacing them? \$\endgroup\$
    – Maverick
    Jan 5 '18 at 22:31

Buy a replacement , keep cool and never drain to zero charge for long periods. Expect less lifetime.


  • \$\begingroup\$ Thank you, unfortunately the non OEM packs won't work for ideapads, it recognize the PCB and won't accept them. google.fr/… \$\endgroup\$
    – Maverick
    Jan 6 '18 at 9:10
  • \$\begingroup\$ You can still get genuine battery packs online but is it worth it? Or you can buy Panasonic cells and hope a repair works \$\endgroup\$ Jan 6 '18 at 12:46
  • \$\begingroup\$ No, I have contacted many Lenovo and IBM distributors. Many emails and forums posts later, no luck. The only packs you can get are 4400 mah and around 60-80 $ without shipping. So already bought the cells, reading online how to replace them. Not an easy task! \$\endgroup\$
    – Maverick
    Jan 6 '18 at 18:13
  • \$\begingroup\$ Does the charger operate mobile without battery? It should. \$\endgroup\$ Jan 7 '18 at 14:27
  • \$\begingroup\$ Yes, it does. No issues with the charger, and even though the capacity of the cells has dropped to 2400 mah it does not shut down suddenly and it charges up normally. \$\endgroup\$
    – Maverick
    Jan 8 '18 at 10:49

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