USB AA charger

18 posts / 0 new
Last post
strongest2004
strongest2004's picture
Offline
Last seen: 2 years 2 weeks ago
Joined: 01/24/2014 - 19:32
Posts: 370
Location: Philippines
USB AA charger

I have been looking for a portable USB AA charger similar to this one being sold at FT:

https://www.fasttech.com/p/1333001

Appreciate if you can recommend one that is a little “smarter” than the one above. I would prefer if it can charge 2 AA/AAAs simultaneously and terminates properly if the batteries are full already. The charger above is OK except user has to monitor manually if the battery is full already.

TIA.

Low mode and long runtime lover…

ReAvenger
ReAvenger's picture
Offline
Last seen: 11 months 3 days ago
Joined: 08/26/2014 - 09:52
Posts: 90
Location: Australia

I’d suggest the reason that with the relatively low power output of usb 2.0, has deterred many manufacturers from bothering to create these devices, and utilising usb 3.0 for the higher output is too expensive. I’m not sure there are many options out there, above the chargers that will just do the job

flydiver
Offline
Last seen: 48 min 9 sec ago
Joined: 06/19/2013 - 19:16
Posts: 1321
Location: Seattle, WA

USB 2.0 500 mA[a] 5 V 2.5 W
USB 3.0 900 mA[b] 5 V 4.5 W

With that kind of output you are highly unlikely to find any ‘smart’ NiXX charger.
OTOH, the one you link to has 0.16A output so is pretty safe for AA though a bit high for AAA.

To Air is Human, to Respire….Divine.

HKJ
HKJ's picture
Offline
Last seen: 2 days 4 hours ago
Joined: 05/24/2011 - 12:23
Posts: 7451
Location: Copenhagen, Denmark

flydiver wrote:
OTOH, the one you link to has 0.16A output so is pretty safe for AA though a bit high for AAA.

0.16A is way to low for both AA and AAA, it is very doubtful a -dv/dt algorithm will work at that current.

My website with reviews of many chargers and batteries (More than 1000): https://lygte-info.dk/

lagman
lagman's picture
Offline
Last seen: 2 weeks 23 hours ago
Joined: 05/13/2014 - 12:24
Posts: 583
Location: France

5W is enough to charge 2 AA at 1A. Virtually all USB ports can deliver 5W in reality.
2.5W would be enough to provide about 0.7A to 2 AA. That’s assuming 80% efficiency which might be a bit optimistic…

My English isn’t perfect but I’m trying to improve it. If you see something that doesn’t sound right or is just plain wrong, please feel free to point it out! Smile

Overclocker
Offline
Last seen: 4 years 1 month ago
Joined: 05/20/2012 - 14:28
Posts: 275
Location: Philippines

sanyo mdu01 or panasonic equivalent bq-cc14

delta-v termination. individual channels

HBomb
HBomb's picture
Offline
Last seen: 4 years 12 months ago
Joined: 06/13/2011 - 16:39
Posts: 770
Location: USA

I have one of the soshine SC-F3, but it is only 1 channel but does 800 mAh for Nimh cells. Chloe and HKJ have reviewed it here.

And this project looks cool too:
http://www.ultrasmartcharger.com/

brad
brad's picture
Offline
Last seen: 4 hours 18 min ago
Joined: 12/04/2012 - 02:07
Posts: 2412
Location: USA

I bought 2 of those for 79 cents apiece on sale and really like them, I can’t rate chargers, but they sure seem gentle charging, small, and convenient to me, I keep one in the car. It would be easy to keep one with your laptop if you carry one around.

Not what we have but what we enjoy, constitutes our abundance.

Racer
Racer's picture
Offline
Last seen: 5 years 6 months ago
Joined: 05/07/2013 - 00:39
Posts: 1792
Location: Hillsboro, OR

Just a couple thoughts about these Chinese USB chargers. I keep one of those cheap chargers in my disaster bag to go with the solar panel, power pack and Eneloop AA and AAA batteries. I also keep one in my electronics bag and on the road I often charge AA batteries from a power pack. With the compact solar power bank and the other ones I carry, it’s usually close to a week before I even need to plug in. Most of my gadgets are USB but I obviously have flashlights and other gear like computer mice and a little Canon point-and-shoot camera which takes AA.

Most of the time I’m using AA or AAA batteries as matched pairs as measured with an analyzing charger, so it doesn’t bother me that this cheap charger doesn’t use separate channels. One good thing about this charger is that it’s very light. Since I usually travel heavy, I’m always looking to shave off weight without losing functionality.

So I guess what I am saying is that I highly recommend those cheap fasttech / dx.com chargers as long as long as they are used responsibly.

brad
brad's picture
Offline
Last seen: 4 hours 18 min ago
Joined: 12/04/2012 - 02:07
Posts: 2412
Location: USA

When I use mine, when the red light dims on a battery I put my voltmeter leads to the charger to read the voltage, and when one of the batteries gets to what I think is correct, I pull out that battery.

Is that the correct thing to do, or am I missing something?

Not what we have but what we enjoy, constitutes our abundance.

strongest2004
strongest2004's picture
Offline
Last seen: 2 years 2 weeks ago
Joined: 01/24/2014 - 19:32
Posts: 370
Location: Philippines

Thanks a lot for all the responses.
I apologise if I wasn’t able to include in the original post that I intend to use it as part of my emergency bag or when travelling light like what RaceR mentioned in his reply. I don’t mind if it takes 1-2 whole days to significantly charge my eneloops, better that not being able to charge them at all. If I am home or have access to regular wall power, I use my Sanyo AA/AAA charger and sometimes my Opus charger. For home use, the 2 mentioned are more than enough for my needs. But when I am mobile or when power failures happen, I want to have the option of charging my eneloops from my vehicles CLA or through my USB power banks.

I really like those Sanyo/Panasonic USB chargers posted by Overclocker but they are hard to find in my place. I bet they will also be relatively more expensive.

Low mode and long runtime lover…

brad
brad's picture
Offline
Last seen: 4 hours 18 min ago
Joined: 12/04/2012 - 02:07
Posts: 2412
Location: USA

If you buy the cheap spices at Walmart or other stores, that little plastic container is perfect for holding that charger, I drilled a few holes to in it to not trap moisture, wrapped the charger in a piece of thin bubble wrap, and put it in the container, that keeps it completely crush proof.

Not what we have but what we enjoy, constitutes our abundance.

Racer
Racer's picture
Offline
Last seen: 5 years 6 months ago
Joined: 05/07/2013 - 00:39
Posts: 1792
Location: Hillsboro, OR

FYI lots of chargers like the i4 and the Opus can be used in a vehicle with a 12V cord.

Overclocker
Offline
Last seen: 4 years 1 month ago
Joined: 05/20/2012 - 14:28
Posts: 275
Location: Philippines

strongest2004 wrote:
Thanks a lot for all the responses.
I apologise if I wasn’t able to include in the original post that I intend to use it as part of my emergency bag or when travelling light like what RaceR mentioned in his reply. I don’t mind if it takes 1-2 whole days to significantly charge my eneloops, better that not being able to charge them at all. If I am home or have access to regular wall power, I use my Sanyo AA/AAA charger and sometimes my Opus charger. For home use, the 2 mentioned are more than enough for my needs. But when I am mobile or when power failures happen, I want to have the option of charging my eneloops from my vehicles CLA or through my USB power banks.

I really like those Sanyo/Panasonic USB chargers posted by Overclocker but they are hard to find in my place. I bet they will also be relatively more expensive.

strongest2004
strongest2004's picture
Offline
Last seen: 2 years 2 weeks ago
Joined: 01/24/2014 - 19:32
Posts: 370
Location: Philippines
Racer wrote:
FYI lots of chargers like the i4 and the Opus can be used in a vehicle with a 12V cord.

Thanks Racer.
You are right. I am actually looking for a 12V lighter adaptor (don’t have one) that can do min of 3A so I can use my Opus in my car. Only drawback I see is the size of the Opus vs something as small as the sample I posted in the OP. I am also not sure if the Opus can still charge properly 2xAA batteries even at the lowest 200mA level if connected to a 12V 2A DC source.

Low mode and long runtime lover…

strongest2004
strongest2004's picture
Offline
Last seen: 2 years 2 weeks ago
Joined: 01/24/2014 - 19:32
Posts: 370
Location: Philippines

Overclocker wrote:
strongest2004 wrote:
Thanks a lot for all the responses.
I apologise if I wasn’t able to include in the original post that I intend to use it as part of my emergency bag or when travelling light like what RaceR mentioned in his reply. I don’t mind if it takes 1-2 whole days to significantly charge my eneloops, better that not being able to charge them at all. If I am home or have access to regular wall power, I use my Sanyo AA/AAA charger and sometimes my Opus charger. For home use, the 2 mentioned are more than enough for my needs. But when I am mobile or when power failures happen, I want to have the option of charging my eneloops from my vehicles CLA or through my USB power banks.

I really like those Sanyo/Panasonic USB chargers posted by Overclocker but they are hard to find in my place. I bet they will also be relatively more expensive.

!http://i.imgur.com/lNf8OIB.jpg!

Thanks Overclocker for the very precise info. :bigsmile: Hmm, expensive at the posted price of approx $26. Clear example of Law of supply and demand.

Low mode and long runtime lover…

Overclocker
Offline
Last seen: 4 years 1 month ago
Joined: 05/20/2012 - 14:28
Posts: 275
Location: Philippines

strongest2004 wrote:
Overclocker wrote:
strongest2004 wrote:
Thanks a lot for all the responses.
I apologise if I wasn’t able to include in the original post that I intend to use it as part of my emergency bag or when travelling light like what RaceR mentioned in his reply. I don’t mind if it takes 1-2 whole days to significantly charge my eneloops, better that not being able to charge them at all. If I am home or have access to regular wall power, I use my Sanyo AA/AAA charger and sometimes my Opus charger. For home use, the 2 mentioned are more than enough for my needs. But when I am mobile or when power failures happen, I want to have the option of charging my eneloops from my vehicles CLA or through my USB power banks.

I really like those Sanyo/Panasonic USB chargers posted by Overclocker but they are hard to find in my place. I bet they will also be relatively more expensive.

!http://i.imgur.com/lNf8OIB.jpg!

Thanks Overclocker for the very precise info. :bigsmile: Hmm, expensive at the posted price of approx $26. Clear example of Law of supply and demand.

used to be P480 at cdrking

strongest2004
strongest2004's picture
Offline
Last seen: 2 years 2 weeks ago
Joined: 01/24/2014 - 19:32
Posts: 370
Location: Philippines

Overclocker wrote:
strongest2004 wrote:
Overclocker wrote:
strongest2004 wrote:
Thanks a lot for all the responses.
I apologise if I wasn’t able to include in the original post that I intend to use it as part of my emergency bag or when travelling light like what RaceR mentioned in his reply. I don’t mind if it takes 1-2 whole days to significantly charge my eneloops, better that not being able to charge them at all. If I am home or have access to regular wall power, I use my Sanyo AA/AAA charger and sometimes my Opus charger. For home use, the 2 mentioned are more than enough for my needs. But when I am mobile or when power failures happen, I want to have the option of charging my eneloops from my vehicles CLA or through my USB power banks.

I really like those Sanyo/Panasonic USB chargers posted by Overclocker but they are hard to find in my place. I bet they will also be relatively more expensive.

!http://i.imgur.com/lNf8OIB.jpg!

Thanks Overclocker for the very precise info. :bigsmile: Hmm, expensive at the posted price of approx $26. Clear example of Law of supply and demand.

used to be P480 at cdrking

I remember now seeing them at CDR-King when I bought 2 packs of Gen 2 Eneloops some years ago for my camera flash. Thanks.

I am currently looking at the Soshine SC-F3 from FT. Might also get a Miller ML-102 and make it a pair.

Low mode and long runtime lover…