Laptop Choice?

I went for one of these: https://www.amazon.co.uk/dp/B06WGV8119/r

No point going for the official... they're old and degraded too. So I figured I would get fresh batteries that fit the form factor well.

I used the power utils to do the conditioning and could get to their full capacity, and they've been fine.

I also left a review!

I run Linux on my X220 and tlp stat is my friend, so I can provide some insight into the battery you are likely to receive.

Here is my old original Lenovo produced 29+ Thinkpad battery stats:

+++ ThinkPad Battery Status: BAT0 (Main / Internal)
/sys/devices/platform/smapi/BAT0/manufacturer = SANYO
/sys/devices/platform/smapi/BAT0/model = 42T4861
/sys/devices/platform/smapi/BAT0/manufacture_date = 2011-06-14
/sys/devices/platform/smapi/BAT0/first_use_date = 2011-06-20
/sys/devices/platform/smapi/BAT0/cycle_count = 156
/sys/devices/platform/smapi/BAT0/design_capacity = 57720 [mWh]
/sys/devices/platform/smapi/BAT0/last_full_capacity = 35880 [mWh]
Capacity = 62.2 [%]

As you can see, last_full_capacity is only 35880 and as such it's only getting 62% of it's design_capacity... and it's old. Manufactured in 2011.

Now the Green Cell battery:

+++ ThinkPad Battery Status: BAT0 (Main / Internal)
/sys/devices/platform/smapi/BAT0/manufacturer = SANYO
/sys/devices/platform/smapi/BAT0/model = 45N1023
/sys/devices/platform/smapi/BAT0/manufacture_date = 2018-07-07
/sys/devices/platform/smapi/BAT0/first_use_date = 2012-03-13
/sys/devices/platform/smapi/BAT0/cycle_count = 1
/sys/devices/platform/smapi/BAT0/design_capacity = 44000 [mWh]
/sys/devices/platform/smapi/BAT0/last_full_capacity = 48820 [mWh]
Capacity = 111.0 [%]

The Green Cell is modern manufacture and has a design capacity which is less than the original ThinkPad battery.

This battery overcharges to give the advertised (in the Amazon listing) capacity... the real capacity being 44000mWh. The circuit has been designed to allow this, and overcharging Li-ion batteries is not a problem and doesn't affect the life span of the battery.

I'm happy with this. I would much rather have cells of more recent manufacture than risk the purchase of old cells that are still the original part.