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I recently purchased a new Li-ion battery for my HP Probook 4520s PC which claims to be 5200mAh/58Wh. When I ran battery scan with windows powershell, I saw that the capacity was 45Wh.

I was directed by the user manual to use the battery till 2% then fully charge the battery to 100% (The battery was at 72% when I bought it new). But the battery shuts down at 38% (From the 72%). I fully charged the battery and then try to use it to 2%, but It always shuts down before 10%.

I ran the battery scan now on powershell and discovered that the battery capacity has reduced to 40Wh. Photo of the Scan, Second Photo of Scan

How do I stop the battery from shutting down before 5/10%. And is there a way to increase the battery capacity back to 45Wh or even to the claimed capacity of 58Wh? Thank you.

scisamir
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I've found this to be pretty typical behaviour of aftermarket batteries. These OEM knock-off's made in China (some even with OEM branded labelling) never quite perform as advertised.

I suspect it's due to not-quite-right (poorly designed/reverse engineered?) battery management circuitry and/or inferior (cheap) lithium cells - at least in comparison to the OEM equivalent.

The mAh/Wh always fall short to varying degrees (some sellers are better than others... if you find examples priced significantly lower, they've probably cheaped out with LiPo cells), the empty/0% state of charge tracking is off (by about 10%), and capacity drops VERY quickly when under load at low charge states (e.g. playing FHD video can drop you from 25% charge to a powerless state rather suddenly).

But for basic tasks/office work/web browsing they do the job. And as they say, you get what you pay for... these are typically much cheaper than OEM and conveniently are still available long after the big-brands ceased production.

My reccommendation is to;

  1. Always buy the largest capacity battery you can (and make sure they're LiIon cells, preferably from Japan or Korea) &

  2. Find that sweet spot for where it actually reaches 0%, and adjust your systems power management settings accordingly, to avoid sudden/unexpected shutdowns (e.g. set low power warning at 20%, etc.).

Far from ideal, I know, but I hope that helps.

user1138
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