Biggest AA NiMH mAh ratings?

[Rainbow Man]

Was just wondering what size ("virtually speaking") batteries are available these days.

Tghe most powerful I personally have are 2800mAh which I use in my digital SLR (easily snap 1500, maybe 2000 pictures with these as long as I stay away from the flash which seems an immense powerhog).

Peace.

 

[Albuquerque]

Nobody really uses NiMH anymore for the really high capacity stuff; it's mostly Lithium-ion or Lithium-polymer these days. Nickel metal hydride is heavier and while it less "memory" issues than nickel cadnium, it's still not as good (or, last I recall, as cheap) as Lithium-based devices.

As far as lithium polymer devices go, you can get stuff into the 80,000mAh and even bigger, but of course you have to also accept the size. So are you asking more about power density (amperage versus mass) or just total power?

 

[swaaye]

I think he's asking about the AAs. I have some that are 2500 mAh. Got 'em at Walmart; they are Energizers.

http://www.steves-digicams.com/nimh_batteries.html

There are actually non-rechargeable Lithium AAs too. They probably have amazing capacity, but are also amazingly not cheap considering they are one use. You definitely wouldn't want to use alkalines in a digital cam because of their rapid voltage fall off. So the charts are kinda useless cuz of that.
http://www.energizer.com/products/lithium/default.aspx

 

[Rainbow Man]

Albu;

Maybe you misread the topic; I'm talking about the standard penlight (AA) style battery. :smile:

It would be interesting if there were more powerful rechargeable Li-ion/polymer style AAs (minus the swell-and-explode/catch fire factor of course) but I just haven't seen any.

Do they actually exist? All I find is NiMH.

Weight isn't much of an issue to me to be frank; as long as they're not lead heavy I'llmanage. What matters is the total charge capacity they carry. Not Ah/weiight unit.

Peace.

 

[AlNom]

There are actually non-rechargeable Lithium AAs too. They probably have amazing capacity, but are also amazingly not cheap considering they are one use. You definitely wouldn't want to use alkalines in a digital cam because of their rapid voltage fall off. So the charts are kinda useless cuz of that.
http://www.energizer.com/products/lithium/default.aspx

They sure are powerful in my camera. I've used my cam to take hundreds of photos with the LCD screen on (Fujifilm E510), and the batteries are going strong since January. Gotta love free stuff at CES.

 

[Zaphod]

Do they actually exist? All I find is NiMH.

Yes, but currently they're not all that common, aren't really available in higher capacities than NiMh, and are more expensive for a given power output. As far as exploding goes, the protection circuitry are part of the reason they're expensive (there are unprotected ones as well, but I'd stay away from those). Finally, there's the issue with not being interchangeable with standard AA batteries due to the difference in nominal voltage (3.6V, 4.2-2,4 operating range).

I expect more devices to start using these going forward, though, as they can deliver closer to their rated output at a higher continuous load than nickel-based rechargeables or alkalines.

 

[Rainbow Man]

If they're not interchangeable with AA then they're not really AA, right?

Different form factor? Coz 3.6V in AA form factor would explode anything you put it into.. Not good!
Peace.

 

[Zaphod]

If they're not interchangeable with AA then they're not really AA, right?

Yeah. Sorry for the lack of exposition. Was more of a forward looking sidetrack, and I have no idea what Energizer is doing with their single-use lithium-based AAs. Some equipment can replace 2xAAs with a single rechargeable CR-V3, though.

Different form factor? Coz 3.6V in AA form factor would explode anything you put it into.. Not good!

Different standard form factors, but I've seen cells that were pretty close. I don't think that'll be much of a consumer issue, though, but many a photographer have blown out flash bulbs or other equipment experimenting with rechargeable lithiums (when they first started becoming available for equipment designed to take both NiMh and non-rechargeable Li-Ion).

 

[Sxotty]

They sure are powerful in my camera. I've used my cam to take hundreds of photos with the LCD screen on (Fujifilm E510), and the batteries are going strong since January. Gotta love free stuff at CES.

I took 480 pictures with the energizers mentioned in the thread in an A95 lcd the whole time.

The energizers I have had bad luck with though. They work splendid then die. My 2300mah duracells seem to have lasted thru more cycles. I tried the energizer charge, the duracell charger, and a la crosse charger I have on them, but the nergizers always seem to die after only like 10 cycles.

http://www.imaging-resource.com/ACCS/BATTS/BATTS.HTM a bit old though

 

[Rainbow Man]

the nergizers always seem to die after only like 10 cycles.

They last for only 10 recharges? That's awful, I've never heard of a rechargeable battery performing so poorly. Surely there must be a manufacturing flaw?
Peace.

 

[Fox5]

They last for only 10 recharges? That's awful, I've never heard of a rechargeable battery performing so poorly. Surely there must be a manufacturing flaw?
Peace.

I had alkaline rechargables that were only rated for 50 recharges, but often failed well before that anyway.