Instant laptop capacity loss?

[e-pirate]

Hi folks.
Just got a fresh battery for my oldish Lenovo X230. The battery is less then a week old and gone through 3-5 discharge cycles.
Today I noticed that it already lost 5% of it's original capacity:
# acpitool -B
    Remaining capacity : 53550 mWh, 98.49%
    Design capacity    : 57720 mWh
    Last full capacity : 54370 mWh, 94.20% of design capacity
    Capacity loss      : 5.804%
    Present rate       : 0 mW
    Charging state     : Unknown
    Battery type       : Li-ion
    Model number       : 45N1025
    Serial number      : 19141

I checked the battery yesterday and it showed 0.1% capacity loss. Besides, today the laptop failed to go to the sleep mode (this happen time to time to my X230) and the machine was hanging ON with fan running in my backpack unattended for about 40 minutes. But it was idling and when I found this, the case was just warm, maybe 40-45 C - this should not be a problem for LiIon that is 85% charged AFAIK.
Could this be related?
Can I do something about this?
How this numbers acre actually calculated without going through full cycle?

[Haenk]

Original or 3rd party battery?
I think the "latest" BIOS plus battery tool (AFAIR this is even pushed to the machine via Windows Update) don't like 3rd party batteries.

[e-pirate]

Original or 3rd party battery?
I think the "latest" BIOS plus battery tool (AFAIR this is even pushed to the machine via Windows Update) don't like 3rd party batteries.

Well.. it's very difficult to say if it is truly original or not. It is claimed Lenovo, it is recognized by the original non-patched BIOS and look like original (except the logo which is slightly different font, but that may be legit as Lenovo office light box here in Moscow has same different font this days). And the machine never booted with widnows since it was bought in late 2013, so no sh*ty updates. The battery cost me 2550 Rubles (about 32 Euro) and that is at least 2 times 3rd party price. Frankly speaking, I have no clue if it is original or not. All except the font including SN sticker, date code, plastic, rubber foot looks like my original 7 y.o. pack.