Yep time for a new battery

 

Yep....I agree time for a new one

 

The device came out in 2015.
It is safe to say that batteries for it were produced for as long as the device was, maybe a bit longer.

What that means for you is that any 'new' battery you get now has been in a warehouse for a long time.

These batteries age (and not well) with time, whether or not they get used- they degrade.

The normal lifespan for them is 2-4 years.

Any battery you get now will have aged and will most likely not be as satisfactory as the last one.

 

No, unfortunately what the device shows as 100% charged is only a vague voltage measurement.

What matters is the capacity, which is measured in milliamphours.

This is what degrades over time, the capacity.

You can have a full voltage charge and yet only have a few hundred milliamps of capacity (even less).

These batteries are rated for 1,500 (rare nowadays) and above, the norm being well above double that.

Even the cheapest modern devices have 3,000 mAh batteries.

There is a way to continue using the device, but it is not pretty or particularlly simple.
It involves removing the end of a USB cable, putting the cable through a hole in the back cover, and attaching the wires (+ to + and - to -) directly to the contacts of the device, then the old battery is put back in to both hold the wires tight and because a battery must be present anyway.

This is quite a pain, but it might work.
This would be like a last ditch effort to get needed data/media off of the device before it goes to digital heaven (or hell, I guess).

 

That is a decent test, but remember that any previous battery is just that much older now than it was when it was replaced.

If you chooae to replace it, what I have done and always had excellent results was to (and it is excellent that you have the original battery, and now you have a legitimate reason to tell your wife, lol) take the model number of the original battery and place it in the search bar of your browser.

Nothing else- just the model number alone- and be sure it is exact.

Enter like you are doing a search (you actually are).

Ignore any info from e-bay, or used batteries- stick with Amazon or Samsung, or the like.

Also ignore any info about what devices the battery fits or is for- if the model number matches exactly it is the same battery.

Try to find a source where the battery is still being produced, ie. not discontinued.
(This may not be possible, but it is worth a shot.)

I have replaced the batteries in three phones this way, one was 'not replaceable' (I called BS on that) and all are working fine now.

I wound up spending about $20 per battery after tax, shipping, etc.

Good luck!