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Repair and troubleshooting information for the Dell Alienware 13 R3, a gaming laptop that is produced by Dell.

New Battery Capacity Question

Good day all.

I received a new battery from ifixit for an Alienware 13” R3 and it’s rated capacity is 76000 however, after 2 weeks it only charges to 72109.

The team at ifixit offered to refund or replace but before doing either I asked them their opinion. They suggested asking on the forum.

The battery arrived with a very low charge; NBD and I expected after a couple cycles that it would be fine. It seems to me that the battery is already in a degraded state; what are your opinions?

The goal was a fresh start with a full capacity battery; am I expecting too much?

I have no problem replacing it again, just don’t want to be going down a rabbit hole; LOL.

Thank you!!

William 

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Answer this question I have this problem too

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@williamk61042 there is a lot of theory involved here. Remember that the design capacity is a theoretical target, but the actual yield of a brand-new battery commonly falls to anywhere between 90% to 100% of that target. Now lets look at your battery. Divide the full charge capacity of 72,109 mWh by the design capacity of 76,000 mWh which gives you 0.9488. That means you battery is holding 94.88% (okay let's round it to 95% ;-)

Now, you need to consider that some of the harder working laptops like your Alienware create a lot of heat which is actually a leading cause of lithium-ion wear. It is entirely possible that your Alienware's BIOS or battery management system likely caps charging at 95% to reduce voltage stress and prevent premature wear.

You mentioned that "after 2 weeks it only charges to 72109" but look at it this way. It started with 72,109 and remained at 72,109. No rapid decrease, no change in charge capacity. Looks pretty steady and I would consider this my normal number.

Treat the patients not the numbers :-) Personally I believe the battery is doing what it is supposed to do and I would use it without worrying about the numbers to much.

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William K will be eternally grateful.
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