Battery capacity (mWh) dropping fast

[mahdi75]

Here's what I get from battery monitor:

I think it was 42,484 from the beginning (I refreshed my PC at 2014-09-27, so I don't have previous data)

But as you can see, it dropped from 42,484 to 41,888 in just a few days.

Is it normal? What should I do?

I'm really worried about this, because I live in Iran, so I can't ask for replacement easily (I have to ship it to other country if something bad happens to my Surface)

 

[GreyFox7]

How far does your battery discharge on a normal basis. Take it down to 10% then fully charge it.

 

[Liam2349]

Charge your battery to 100%, leave it at 100% for half an hour or so to make sure it's properly maxed, then drain it completely until the device shuts down.

After this, post what your new maximum capacity is.

 

[mahdi75]

Oh, seems that this is changing randomly.
The device was plugged in whole night, and now it's capacity is 42,104.
I'll try draining battery till 10% if it started to decrease again.

 

[Liam2349]

Oh, seems that this is changing randomly.
The device was plugged in whole night, and now it's capacity is 42,104.
I'll try draining battery till 10% if it started to decrease again.

Not to 10%, but until the device shuts down.

 

[wynand32]

I've noticed that the battery wear on mine has been all over the map as well. It seems very related to whether or not I use it on battery or keep it plugged in--when I use it on battery, the indicated wear seems to vary more, but once I plug it in it eventually returns at least to 0% wear.

It does seem like the SP3 varies more in this metric, but I've also had notebooks with batteries that wore much more quickly and never recovered.

 

[GreyFox7]

Its a variance of +/- .007 relax.

 

[tallshorty]

my SP3 256GB battery wear is at 3.1% according to battery bar with max capacity now at 40,850mWh. I had the device since launch.

 

[yonghong]

my SP3 256GB battery wear is at 3.1% according to battery bar with max capacity now at 40,850mWh. I had the device since launch.

Me too ,what happened? Most time I use the charger.

 

[Liam2349]

Me too ,what happened? Most time I use the charger.

If you leave it plugged in 24/7, then your battery will degrade faster than only charging it when necessary.

 

[mahdi75]

Me too ,what happened? Most time I use the charger.

I'm using my surface pro 3 mostly plugged in.

It went to ~1% wear according to BatteryBar. but now it's again 0.0%.

 

[yonghong]

If you leave it plugged in 24/7, then your battery will degrade faster than only charging it when necessary.

make no sense.