My Lumia 2520 with Nokia Power Keyboard shows Battery #1: Fully charged (100%) and Battery #2: 0% available (plugged in, charging). However, even after more than 8 hours plugged in and showing 'charging', Battery #2 never shows more than 0%.
The tablet was a used gift,but the keyboard is new, ordered online from Verizon. It has done this from the first time using the tablet with the new keyboard. As far as I know, the tablet never had a keyboard attached until now. All keyboard functions appear to work properly and all tablet functions appear to work properly. I used the tablet with the keyboard for several hours unplugged and the Battery #1 disharged to about 80%. When I plugged it in, Battery #1 charged up to 100% and then it showed Battery #2 plugged in and charging, but never changed from 0% available on Battery #2.
Nokia's own help page (which, incidentally, states that 'Nokia offers two types of batteries: Batteries with hologram label, and Batteries without hologram label') on the subject isn't very helpful. More usefully, on the back of each genuine battery is a long serial number. Each battery made has its own ID in this form, but what's needed here. When the battery is full, disconnect the charger from the phone, then from the wall outlet. You don't need to charge the battery for a specif ic length of time, and you can use the phone while it's charging. If the battery is completely discharged, it may need to charge for up to 20 minutes before you can use your device.
Nokia Battery Check Serial Number Online
I have tried the Power button and +Volume button technique with no change. It does go throught the stages of showing 0%, not charging on both batteries and then after resetting it goes back to showing the same issue of never showing an increase in Battery #2charge % beyond 0%.
Nokia telephone tech support had me go through that same exercise with no fix. I also refreshed Windows to see if a driver was corrupt with no joy.
None of the nearby Verizon, AT&T or Microsoft stores have the Nokia Porwe Keyboard in stock so I ordered another keyboard from Verizon and if it works then will get a refund on this one that isn't working.
If anyone has any other ideas on how to get the keyboard battery to show that it is charged beyond 0% then please let me know so I won't be returning a good keyboard thinking it is defective.