Reply To: Dell Inspiron 7570 Laptop Battery I have an Dell Inspiron 7570 Laptop Battery that keeps the laptop on powered for 10 minutes nowadays. The battery is 42 wh – 11.4v – 3500mAh WDXOR Dell and…

[SH]

there is few way to know what your getting … in terms of batteries
1) – ask seller what’s manufacturing date of the batteries
2) –  if buying from Amazon ( u can scroll down and look for “Date first available at” ) .. this will give u some rough picture
3) – look at laptop models that particular batteries are compatible .. ( so example lets say u see Dell Vostro 5568 .. that mean it’s using 7th gen intel processor … so 3-4 years old ..so we know dell been using it last few years …….dell t provide 1 year warranty on all products )
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now taking above stuff in picture ….. we know Lithium-ion discharge rate is about 3% to 4% per month approx ….. that mean full discharge will occur in about 2 years 1 month ( if kept in shelf as it is without charging )

now the typical estimated life of a Lithium-Ion battery is about 300+ charge cycles, One charge cycle is a period of use from fully charged, to fully discharged, and fully recharged again.

now if seller charged it 2-3  times per year to preserve battery and stored in good temp …before selling it   ……………. we can except wear level of 1% to 5% ( can still hold 99% to 95% of charge )

now if battery is counterfeit , taken from used laptop or stored in bad condition with no care  … wear level will be from 25% to 60%+ ………

you can calculate wear level and set your parameter .. about good and bad condition battery …

before buying .. check reputation of seller , reviews …seller location etc etc ..

combing everything will give you rough picture of what your going to get and you u can always return it . if it don’t falls as per your expectation and get another

Note: – I can be fully wrong about Lithium-Ion and above theory …..so  please take it as grain of salt.
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