Double posted as usual, sorry!
WOW Soundcore Boom Plus
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When talking a look at this battery drain its always important to know the volume.
the speaker is used-
High volume -> fasted drain.
My Motion Boom arrived yesterday, and seeing this now, I feel like selling it off after a few months & getting motion boom plus…
Anker makes beastly speakers!! Love em!
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Yes i know, my comment was a follow-up from the previous one where i mentioned the 15hrs being on low to medium volume. 
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Can you screenshot / photo the manual and the underside of the case to show the charging specs? The FCC posting has 5V 3A.
What is your charger spec? (make / model or photo of it’s output spec)
So from “almost dead” to 100% you took 4 hours?
That means the FCC posting is wrong, the input power is actually higher, or something else is amiss. The specs and performance don’t match.
Sorry i am not a tech pro like you. I just used my regular phone charger to charge the boom plus. 
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What was your phone charger (photo / whatever)?
You have the manual. Does it say 5V 3A input?
Does the underside of the speaker similarly show 5V 3A input?
Thanks so it’s a 5V 2A charger and the released product is 5V 3A input.
You said it took 4 hours from nearly empty to full, so the claimed 13.4Ah cells with their FCC posting says is 7.2V so is a 96.48Wh battery, your 10W charger should if everything ran perfect 100% efficiency should have taken 9.6 hours, so I’d expect with some losses to be over 10 hours.
7.2 X 13.4 / 5 / 2 = 9.648
So one of these is wrong: it was nearly empty, took 4 hours, the cells are 13400mAh, 7.2V, your charger is 5V 2A.
I told you like it is and posted the photos.
With that charger it took 4 hours to go from empty to full.
But what is it that could be wrong?
The battery from the speaker?
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Appreciate the update, and glad you are enjoying the speaker.
If you have any songs that you found push the speaker to the limits, I’d be curious as to which ones 
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Not saying you’re wrong just a mystery. I showed the math.
For example it could be the battery indicator lights are pessimistic and it was half full not nearly empty? Try running it til it turns itself off next time?
Anker said in their sales literature 13400MaH
Their FCC listing said 7.2V
So 13.4Ah , 7.2V are what Soundcore is telling us.
13.4Ah X 7.2V / 5A / 2V = 9.648 hours if everything ran 100% efficiency.
So either Soundcore statements are wrong, or the battery indicators are misleading and should wait speaker turns off, or you had a dud unit with a bad battery, or…?
Also if everything was perfectly efficient 20 hours of 96.5Wh means it had to be 4.8W of the 80W so curious what battery life is like in real life.
Also from an engineering perspective it’s very odd to have 5V input to a 7.2V cell (usually made of two 3400mAh 3.6V in series) as you have insert DC booster circuit.
As more owners use the mystery will be resolved.
I was guessing the FCC A3129 was this speaker so searched to be sure and found a useful resource
https://anker.force.com/soundcoreenexternal/s/article/Soundcore-Motion-Boom-Plus-A3129-FAQ
I’m trying to find out how my basic calculations are so off from what Soundcore have written, I found this:
https://anker.force.com/soundcoreenexternal/s/article/Soundcore-Motion-Boom-Plus-A3129-FAQ
(They wrote it twice)
So 5V 3A would take a minimum of 96.5Wh/15W = 6.5 hours so someone is wrong either about the specs or the recharge time inside Soundcore.
It also does question if you were near flat to recharge from 10W in 4 hours.
One potential explanation is they don’t let the battery discharge too much. One potential reason for that is because as cells discharge the voltage drops and as this is a high power device the speaker cannot function. If that is true then the 13400mAh is misleading as you don’t actually get to use 13400mAh and then would infer the 20 hours figure is a very low volume, or they turn the speaker off at higher voltage at higher volume meaning at loud volume the battery is flat very early.
I’m sure as buyers become owners we’ll learn more.
Okay, well only thing i can do is try it again. One thing i notice is that my phone says the battery is 100% but the chargelight is still red. So maybe it wasn’t fullly charged the last time.
I will post again after my 2nd try.
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Thanks. Run speaker til flat - it turns itself off, then charge til every indicator is full.
Either you’re right - nearer to 4 hours, or Soundcore is right 5.5 hours or I’m right it’s 10 hours.
If I’m not right then means it is not actually a 13400mAh cell like you’d see in other products in that it can’t empty the cells as they turn the speaker off before empty, in which case that would mean the battery life cannot be anyway near 20h at a decent volume.
It seems like either the stated capacity is happy (off) or the voltage cut-off is set pretty high.
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2nd try, battery was fully charged and the motion boom plus played for 28 hours this time. Volume was about 50% continuously and had bass up on all the time. Quite a difference from the previous 15hrs. And it took 5hrs and 40mins to charge it to full with my phone charger.
Besides that, the boom plus is a great speaker. But it really needs a custom EQ to make it come alive.
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Thanks for confirming more performance metrics.
So your 5h40 confirms what Anker said in FAQ as well as 20 hour at reasonable volume.
So by elimination either your charger specs are misleading as it must be giving 5V 3A not 5V 2A.
7.2x13.4/5/3=6.4
Or, and I am suspecting this with increasing probability, the speaker turns itself off before all 13400mAh are consumed, but as it does do 20hr+ then that’s somewhat irrelevant to everyone apart from a geek.
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I see more and more people complaining about the Boom plus.
Mainly about the harshness and batterylife.
Must admit getting 2nd thoughts myself, it’s really hard to make the speaker sound good all the time when playing different kinds of music.
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I guess different sound profile for different music is common for all speakers