AA-powered battery pack with USB port for output?

[Shadowww]

I have many, many USB boosters (ok I have a problem). I've only recently begun to test the efficiency.

For example, the "common" 2x18650 charger on eBay gives you about 3300mAH worth of juice when using 2x AW 3100mAh 18650 batteries (2860mAH @ 1.5A tested). The USB test is using a CBA III Pro discharing at 0.5A down to automatic cutoff. The booster/charger was only $10 and output about 4.7v constant.

Also tested a 4x18650 booster (again eBay ones) which are 4 in parallel. Used again 4xAW 3100mAh (battery tested at 2830mAH @ 1.5A). The voltage regulation is a little better at 4.8v. It gave a "whopping" 6800mAh of juice.

I have an old Noma (exactly like Tekkeon) which uses 4xAA up next for testing using 2900mAH Imedions.

Also JUST tested the Eneloop stick booster (KBC-D1). Uses 2xAA in series. Tried with fresh 2300mAh Imedion and it managed 800mAh. What's more is the output is only 4.5-6v.

Are you sure about precision of your DMM? I have 4x18650 one from eBay (using it with 4x Panasonic NCR18650A, unprotected), and it puts out 5.2V under 0.5A load and 5.0V under 1A load.

[Ualnosaj]

It's connected with a short wire directly to the CBA III Pro analyzer.

Remember though we should be more suspect of the circuit in the $12 eBay power box

However! I'll do a quick check against a known good USB power adapter and my Agilient DMM.

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Sent from my mobile device. Please excuse the brevity of this message.

[REDLINEVUE]

Before you buy an iGo... you may want to see this!

http://www.goalzero.com/shop/p/133/G...tery-Pack/6:2/

[ChrisGarrett]

Before you buy an iGo... you may want to see this!

http://www.goalzero.com/shop/p/133/G...tery-Pack/6:2/

I was just going to post this product. I've been looking at foldable/rollable solar panels these past two days, so I've come across the Goal Zero kit. I think that they've increased the ouput, either on the panel, or the charger, to 1 amp, on the PLUS model, so make sure you understand the differences.

Ebay has these for $30-$40+, sans batteries, delivered, so you can save there. Says it'll charge 1-3 cell phones per pack/charge. Even comes with a built in LED array.

Chris

[reppans]

I have both the iGo and the GZ G10+. They both work on an iPhone, the G10 can put about 10-15/20-25% in an iPad3/iPad2, and can be plugged into a computer USB that will charge the AAs too. But I EDC the iGo for its size.

As far as solar, also take a look at the Powerfilm 4xAA, it's 1/3 the size and weight of the GZ and 1/2 as efficient in perfect sunlight.... interestingly it is 2x as efficient in imperfect sunlight.