USB Power Banks using AA Batteries

Talk about anything.

Moderators: Bearbonesnorm, Taylor, Chew

Post Reply
User avatar
stevewaters
Posts: 174
Joined: Wed Nov 13, 2019 9:23 am
Location: Dark Peak

USB Power Banks using AA Batteries

Post by stevewaters » Mon Feb 17, 2020 8:03 pm

I was wondering if anyone has used this or a similar USB Power Bank which takes 4 x AA batteries ? :

https://www.amazon.co.uk/gp/product/B01 ... UTF8&psc=1

- I thought it might be useful as a back-up for charging my GPS, InReach and Phone when there is not the ability to recharge a "traditional" power bank - perhaps in a race with insufficient time to dwell to get it recharged but with shops selling AA batteries.

It costs £5 posted and weighs 36g without the batteries and (using Energizer Ultimate Lithium batteries) I am getting 4.8V and 0.85A. A quick Google looking at tests of these batteries suggests that at that current I could expect to get 3,000mAh from each battery -> 12,000mAh in total.

It seems too good to be true. - Anyone had any experience of these devices ?
Last edited by stevewaters on Mon Feb 17, 2020 9:14 pm, edited 1 time in total.

User avatar
Bearbonesnorm
Posts: 19231
Joined: Sun Jun 05, 2011 8:53 pm
Location: my own little world

Re: USB Power Banks using AA Batteries

Post by Bearbonesnorm » Mon Feb 17, 2020 8:14 pm

I am getting 4.8V and 0.85A.
Is that enough to charge a phone?
What value a life half lived if the half you lived was the wrong half?

User avatar
htrider
Posts: 3226
Joined: Wed Apr 02, 2014 10:51 pm
Location: Fife
Contact:

Re: USB Power Banks using AA Batteries

Post by htrider » Mon Feb 17, 2020 8:49 pm

I've got a similar one but never used it in anger.... Re the battery capacity my NiMH rechargeable double A's are 2.8 Ah and Lithium ultimates last 3 times as long.....

User avatar
stevewaters
Posts: 174
Joined: Wed Nov 13, 2019 9:23 am
Location: Dark Peak

Re: USB Power Banks using AA Batteries

Post by stevewaters » Mon Feb 17, 2020 8:59 pm

With the batteries in it weighs 133g whereas my 13,000mAh Aker weighs 241g so potentially a good "charge to weight" ratio too.

slarge
Posts: 1982
Joined: Mon Aug 22, 2011 4:49 pm
Location: MTB mecca (Warwickshire)

Re: USB Power Banks using AA Batteries

Post by slarge » Tue Feb 18, 2020 7:53 am

Don’t always trust the mAh number quoted for AAs. You’ll find that their voltage drops considerably at the end of their capacity which limits their ability to charge. As a quick and easy top up they’ll be good though

benp1
Posts: 3380
Joined: Sat Dec 07, 2013 7:36 pm
Location: North London

Re: USB Power Banks using AA Batteries

Post by benp1 » Tue Feb 18, 2020 10:15 am

It's not just the mAh to worry about, it's the voltage. You want to know how many watts (or watt hours) it has

Most powerbanks run off lithium cells, like an 18650, which means they run at 3.7V-4.2V. An AA cell, alkaline or rechargeable, runs between 1.2V and 1.5V

Unless you're desperate to use AA cells to power your electrickery, you'd be better with a normal powerbank or something like a nitecore F1/F2 that is powered from 18650 cells. An 18650 is worth 3-4 AA batteries
Last edited by benp1 on Tue Feb 18, 2020 12:31 pm, edited 2 times in total.

User avatar
Shewie
Posts: 305
Joined: Sat Oct 05, 2019 5:27 pm
Location: Leeds
Contact:

Re: USB Power Banks using AA Batteries

Post by Shewie » Tue Feb 18, 2020 10:35 am

I used to carry a Powrmonkey charger in the days before smart phones, two AA’s would be enough to charge up my old Nokia brick every week or so, not used it for ages but I don’t think it would charge my iPhone on one set of batts, technology should’ve come along since the though.

Lazarus
Posts: 1622
Joined: Fri Aug 30, 2013 10:49 am

Re: USB Power Banks using AA Batteries

Post by Lazarus » Tue Feb 18, 2020 1:56 pm

A quick Google looking at tests of these batteries suggests that at that current I could expect to get 3,000mAh from each battery -> 12,000mAh in total.

It seems too good to be true. - Anyone had any experience of these devices ?
at 4.8 v you would have 3000 mAh at 1.2 volts[most rechargables are this voltage] you have the 12000mAh
the only way to get 12000mAh is if they are 1.2 volt and 12,000mAh[ or use 16 batteries]

Evesie
Posts: 4
Joined: Mon Nov 11, 2019 9:38 am

Re: USB Power Banks using AA Batteries

Post by Evesie » Tue Feb 18, 2020 2:06 pm

Been using one of these for a year. Seems ok for what I use it for, I'm very much an AA based electrikery economy on trips. Will charge devices at 1A, which works on my phone & top up my AA's for ETrex & lights using any available mains supply or car 12v. Pretty versatile really. Price seems to have popped up a tad tho'
https://uk.gpbatteries.com/products/gp- ... nyway-x411

User avatar
dlovett
Posts: 1445
Joined: Sat Nov 08, 2014 6:37 pm
Location: South Coast
Contact:

Re: USB Power Banks using AA Batteries

Post by dlovett » Wed Feb 19, 2020 1:56 pm

I've ordered one off of ebay as the amazon one won't let me buy it. It will come in hand on non dydmao bikes when you can't recharge a power bank.

Post Reply