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ThinkPad NotebooksThinkPad: T400 / T500 and newer T series Laptops
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2 Posts

06-21-2018

GB

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T470 Internal Battery discharges first, even though I'm using a brand new external battery (no wear)

2018-06-29, 15:52 PM

Hi everyone,

 

Title says it all, I know this topic of discharging internal battery first has been brought up a lot, and that the reason behind it is this: The T470s are designed to drain the battery with least wear first so as to degrade both batteries equally and prolong the laptop's overall battery life.

 

However, as I'm using a new 61++ battery, clearly somethig is going wrong somewhere as the year old internal battery cannot be in better condition than the brand new external.

https://gyazo.com/6c12f3f40514599d04d852a8589189ab

 

Any ideas?

 

Thanks!

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6275 Posts

10-29-2009

NC

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  • Posts: 6275
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Re: T470 Internal Battery discharges first, even though I'm using a brand new external battery (no w

2018-07-10, 12:33 PM

It's not the cycle count that defines wear.  Instead, wear is defined as full charge capacity divided by design capacity.  In your screenshot, the internal battery has a full charge capacity that is actually above the design capacity.  That's probably why it's still discharging first.  I couldn't see the design capacity of your external battery from your screenshot.

 

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