Solved: Battery design capcity vs actual capacity - HP Support Community

Mark180564 · ‎05-09-2020

Hi.

Is it normal for a brand new battery to have only 94% of the design capacity full charge on delivery? These are the readings from the internal diagnostic tool.

Battery Age: 5 months.

Design capacity: 3615 mAh

Full charge capacity 3424 mAh (94%)

This means when I fully charge the laptop it drops straight from 100% to 94% when on battery.

Secondly,could this be linked in any way to a high battery drain as I only seem to be getting around 5 hours battery life on power-saver settings against the advertised "up to 10.5 hours light mixed use"?

Be grateful for any thoughts on either point.

Mark

TryToDoMybest · ‎05-09-2020

hello

my opinions are:

yes , battery loses a little of charging capacity every day. after a while you notice that it's not anymore to initial capacity. it's a natural chimical/physical process.

about battery autonomy. if you read carefully the claim is "up to xx.xx hours". never trust battery value pusblish by manufacturer. one battery parameter is Wh. so you you laptop has a 51Wh battery and your paltop has a CPU able to consume 15W is always running at 100% of his capacity, then you have you LCD at 100% of his brightness (it could need 1W or more per hour), then you are using WiFi and SSD. it could arrive to need 16/18 Wh. now divide 51 WH/17w needed by hardware , result is 3 hours, this is probably the minumum autonomy you can have. that should be the value claimed by computer manufacturer , not the never achievable battery life declared as "Up to".

Most of the battery life declared are reachable only using benchmark software such as MobileMark 2014 , that never rappresent the real usage, even becasue the display brightness used for the test is around 150 nits , as user normally put the brightness at 100% , it means menimum 220/250 nits or , depending on the display feaures, could by 400 or more nits.

With newest Mobile Mark 2018 , the battery life values are a lot lower , around 30%, because the notebook is doing something more close to real usage, but still not real.

bye

View solution in original post

TryToDoMybest · ‎05-09-2020

hello

my opinions are:

yes , battery loses a little of charging capacity every day. after a while you notice that it's not anymore to initial capacity. it's a natural chimical/physical process.

about battery autonomy. if you read carefully the claim is "up to xx.xx hours". never trust battery value pusblish by manufacturer. one battery parameter is Wh. so you you laptop has a 51Wh battery and your paltop has a CPU able to consume 15W is always running at 100% of his capacity, then you have you LCD at 100% of his brightness (it could need 1W or more per hour), then you are using WiFi and SSD. it could arrive to need 16/18 Wh. now divide 51 WH/17w needed by hardware , result is 3 hours, this is probably the minumum autonomy you can have. that should be the value claimed by computer manufacturer , not the never achievable battery life declared as "Up to".

Most of the battery life declared are reachable only using benchmark software such as MobileMark 2014 , that never rappresent the real usage, even becasue the display brightness used for the test is around 150 nits , as user normally put the brightness at 100% , it means menimum 220/250 nits or , depending on the display feaures, could by 400 or more nits.

With newest Mobile Mark 2018 , the battery life values are a lot lower , around 30%, because the notebook is doing something more close to real usage, but still not real.

bye

Mark180564 · ‎05-09-2020

Thank you taking the trouble to reply.

This is very reassuring. I just wanted to be sure what I was experiencing was normal and wasn't a problem with the battery.

Regards

mark

Battery design capcity vs actual capacity

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