Where to see the mAh battery capacity (battery health) of your phone?

[mjyumping]

Hello,
I've been using my lumia 1320 for almost 2 years now (bought January 2014) and this is my only phone driver.
I'm thinking of what's the status of the battery now. And I know batteries just don't go down from good to bad immediately, so I wonder if it is probably the time to replace the battery. Yeah, I know the battery is not yet that bad, I still get nearly one day on W10 Mobile (used to last nearly 2 days when it was new and of course on 8.1)
With the status of the W10 mobile as of now, I know it may have lessen my battery life, but I still may have to consider hardware like the battery.

Thank you for reading.
-Mel

 

[LumiaGuy]

I'm sure someone like a Electronic Technician could probably do it but I haven't heard of a way to test a Lithium Ion cellphone battery to see what the general general health state a battery is in. Two years of everyday use is a lot for these small batteries - perhaps replacing it would be the best.