[Galaxy Note 4 General] d4rkkn16ht:
Your Battery has degraded by around 10 to 15% lower than it's original capacity.

This is a common thing especially if you have more than 1 battery & only occasionally swapping battery.

Swapping battery worsen your percentage difference issue as the device still "thinks" that you have a good battery (around 3220mAh) capacity but in real life when you swap the battery with the degraded one it still thinks it is the other one/the better one.

This can be "fix" by deleting batterystats.bin after fully charge your degraded battery, but the issue will pop up again after a while & swapping it with a better battery can induce the issue quicker.

Flashing another ROM will "fix" the issue temporarily as it will also wipe batterystats.bin.

It's not a big problem, just treat your battery better to reduce degradation time.

How to treat your battery (Lithium) ?:

Lithium battery worst enemy is Heat & Time, so no matter how good you treat it, it will degrade through time.

We can only prolong it's lifetime by ....

Avoid direct sunlight

Avoid fully depleted your battery as it need longer charge time = longer heat (from electricity) exposure

Avoid hot/warm surface when you put your device/battery

Avoid storing your device with a power bank while charging if possible as both will produce heat & together it will be heat frenzy.

Avoid Fast Charging if possible.

Fast Charging is a great feature when we need it, but it will also degrade your battery faster as it use HIGHER voltage (9 - 12V) & amperage (~3A) that will produce more heat than 5V-2A (standard charging).

Use it properly & it will increase your battery lifetime.

Avoid wireless charging if possible.

Wireless charging use induction technology to transfer energy with 2 downside.

Slower charging rate efficiency as many energy wasted resulting in ...

... HEAT

But the idea of not plugging your device while charging beats the negative effect (IMHO) & I do it daily :D

I can buy another battery when I needed for my Note 4 :D

Do "short" charge your battery whenever possible even if your battery is not low.

"Short" charge mean charging your battery for a short period of time without quick charger.

Short charge time = less heat exposure time.

Do maintain 40% or 80% battery capacity if you plan to store your battery for a long time.

Storing your battery at 40% can prolong it's lifetime better than 80% but it still better than storing it at 100%.

Some said that extreme cold can preserve it capacity longer but it's inefficient & risking it with water contamination.

At -20ºC (–4ºF) most Lithium battery will stop functioning & need to be heated to room temperature (20ºC/68ºF) for it to function properly.

Best temperature for a lithium battery is at room temperature (20ºC/68ºF) or slightly below

Higher temperature will boost it function BUT also shorten it's lifetime drastically.

Usually battery lifetime for ordinary use for a smartphone is around 2 years (IMHO).

So if you get more than that it's a bonus :D

---------- Post added at 11:14 AM ---------- Previous post was at 11:06 AM ----------

Buy a new battery for your Note 10.1 2014 edition.

I replace my Original Note 10.1 2012 edition battery & it just like new :D

Consult to a technician if you don't know how to disassemble your Note 10.1