LiIon AA, AAA, etc.

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Just out of curiosity, I analyzed a single AA, starting from a full charge. It drained down to 3.2V in 137min delivering 774mAh of energy. Quite a bit above its 630mAh rating. I'll have to cycle thru the other 9 cells and see how they do.
 
I got a response from HyperBattery. They're a bit more expensive than Minamoto.

For 1000 units, the AAs are $2.61/each plus $235 shipping. These are 750mAh 3.7V AAs.

For 1000 units, the AAAs are $2.18/each plus shipping. These are 300mAh 3.7V AAAs.

I'm trying to decide whether to order some samples. It would take a long time to unload 1000. I suppose there's always eBay.
 
Bump.

Samples are $5 apiece plus $34 shipping. I'm putting together a sample order of 10 LiIon AAAs and 10 LiIon AAs for my own testing, but this may be more than I need. Anyone else interested?
 
I'm interested in on ordering some AA and AAA li-ion batteries. I tried to get some from Minamoto but they would not sell me samples even. *Sigh*
Depending on what my share of cost might be, I'm willing to get in on 6AA and 6AAA, maybe more. Email me and let's talk some more.

David
 
I'm interested in 18500's and 17670's. highlandsun, maybe you should start a new thread in the Group Buy forum. You might get more responses there, and we can save on shipping. Email me also and we can talk.


CM
 
Ben H,

Are 17670's available from Minamoto? These will work great with 2x123 LED lights like KL1 and KL4. If they are, I'm definitely interested in those as well.
 
I saw them listed on the Hyperbattery website. I want to use them with the L4.
 
OK bad me. I got Minamoto confused with Hyperbattery. Changed my post above. Anyone know the capacity of these batteries?
 
I don't know exactly, but the spec's I've seen on other websites suggest an average around 1400 mAh.
 
OK. I've been out of town for a few days, but since folks are more interested now I will post in the bulk buy forum.

At the moment I'm only interested in AA and AAA since it seems that these sizes are the most difficult to find. Of course, the 17670s would be good since my Sony laptop packs need 8 of them; I may ask for specs on them as well.

Bear in mind that Hyperbattery normally considers 1000 pieces as their minimum order size. Hopefully they won't blow us off in the 20-100 range. (I think we'll be fine. But at this order size, we're paying $5/each instead of $2.50/each.)
 
Just fyi, I tested a HyperBattery 17670 on my Maha 777+II charger and got 1577mAh discharging from 4.1V to 3.3V. This seems to agree pretty well with their 1500mAh spec. I haven't done a full test on the AA yet. And still waiting for word on the AAAs.


Sigh... I wish we were still dealing with Minamoto, those guys are much more responsive, and they don't seem to have these quality control issues.
 
I have not read the whole thread but I have some questions.
How do you plan on recharging these things? Does the manufacturer have a source for chargers for these?
Are these 1.2 or 1.5 cells or are they higher.
 
[ QUOTE ]
JonSidneyB said:
I have not read the whole thread but I have some questions.
How do you plan on recharging these things? Does the manufacturer have a source for chargers for these?
Are these 1.2 or 1.5 cells or are they higher.

[/ QUOTE ]
Here's a little info:
I use a constant current (vs. pulse) circuit on my Lilons. My 1982 home built kit has an 8 position D.I.P. switch..each successive click corresponding to: 1.5v >3v >4.5v >6v. >7.5v >9v. >12v. and >"double amperage"..

I have found that the #3 click on the D.I.P. switch (4.5v) is just about right for charging the 3.6 volt rating of a single Lilon type cell. When the built-in voltmeter needle on my unit gets to 4.5v, the adjusted voltage cut-off kicks in and terminates the charging.

Rates that I use:
#2032,2025,2016 >8-10mA
"AA" cell>200mA
-I do not yet have a specialized charger for the Lilons, but what I'm doing now has worked well for over 20 charge/discharge cycles now.

What I'm saying is that for every 3.6v Lilon cell you're trying to charge, a fairly ripple-free regulated 4.5 volt constant current (approx.200-500mA for 185/176 series) should work for you very nicely.

As has been said before, you should be very careful to not let the voltage go above 4.2-4.3v while charging so as not to damage the cells.

p.s.-highland sun, have you checked with the people in Alhambra (Batteryworldcenter) re: those AAA Lilons?

-above edited to give better advice, thanx to Doug S)
 
Minamoto is the company I ordered LiIon AAs from last year. They don't make AAAs.

All the info is in this thread, I'm not going to repeat it.
 
[ QUOTE ]
vcal said:


What I'm saying is that for every 3.6v Lilon cell you're trying to charge, a fairly ripple-free regulated 4.5 volt constant current (approx.200-500mA for 185/176 series) should work for you very nicely.

As has been said before, you should be very careful to not let the voltage go above 4.4-4.5v while charging so as not to damage the cells.



[/ QUOTE ]

DON'T DO IT!! Charging at 4.4 to 4.5V is too high. I have tested this extensively. Charging at these voltages will initially give you higher capacity [for the first 10-20 cycles] but the cells will rapidly deteriorate to lower capacity than had they been charged at the proper voltage of 4.20V. If using a "dumb" charger with no timer or residual charging current cutoff circuit, I reccommend that the charging voltage be set at 4.15V. This will give you 2-3% less capacity than charging to 4.20V but will give you more cycle life.
 
[ QUOTE ]
Doug S said:
[ QUOTE ]
vcal said:




DON'T DO IT!! Charging at 4.4 to 4.5V is too high. I have tested this extensively. Charging at these voltages will initially give you higher capacity [for the first 10-20 cycles] but the cells will rapidly deteriorate to lower capacity than had they been charged at the proper voltage of 4.20V. If using a "dumb" charger with no timer or residual charging current cutoff circuit, I reccommend that the charging voltage be set at 4.15V. This will give you 2-3% less capacity than charging to 4.20V but will give you more cycle life.

[/ QUOTE ]
Thanks for that valuable info.

-I'm resetting that cut-off voltage to 4.2v right now.
 
What Doug said is true for Li-Ions. Charge them at 4.10~4.15, not 4.2v. Although 4.2v is max but don't push it. You probably get extra 100ma out of that 0.1v.

You might be able to charge them at 4.4 to 4.5v, if you are lucky, they suffer chemical degradtion, if you are not, they explode. :|

Here's a neat charging circuit I posted a while ago, I found it from rcgroups.com many people have tested and used it.
Lithium Ion Charger

Vince.
 
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