Battery Status Just Interested

[SteveManila1960]

Late 2013 Retina Macbook Pro purchased for my mother in December 2015 while I was living in Singapore. Custom build with 8GB RAM and the 256GB SSD. She uses it as a desktop to be honest the battery has only 49 cycles.

I have used coconut battery for several years to check equipment iPads, iPhones, Mac Pro's, MBA's and never had any reason to query the results.

Today I was bored so downloaded the software to Mum's laptop. Checked my iPhone 2020SE six months old. Coconut battery says battery manufactured January 2021, phone manufactured May 2021, I purchased it in June 2021. Battery health in Apples software 98%, coconut battery 97.6%. All in order, then I checked Mum's laptop.

Battery manufactured December 2014. Laptop manufactured December 2015. Battery design capacity 6,330mAh. All consistent with my purchase. Coconut battery results............full charge capacity 6,451mAh.

The battery efficiency has got better over the last 7 years???? Nah!

Anyone have a theory for this data?

As I said just curious because, given my 83 year old mothers use, it really doesn't matter.

 

[Sanpete]

Measured capacity is sometimes more than design capacity for new batteries, but it's very odd for an old one. The actual charge in store can't be read directly but is derived from other measures that can vary depending on things like when the battery was last charged. They recommend waiting a while (hours or more) after a charge to measure. But by then you'll have lost some charge too.

 

[SteveManila1960]

It is just curious not sure I will ever find out why but as I say it really doesn't matter.