Alkaline batteries and mAH ratings..

[Syringer]

Do they not have mAH ratings as NiMH batteries do? They don't seem to be listed on the battery. And how about lithiums?

 

[Eli]

They do technically, but most manufacturers don't bother.

According to the battery review here, Duracell Ultra come in at 781mAh and Energizers come in at 756mAh.

So maybe they're rated at ~800mAh?

A lot less than NiMH, at least. 😀

 

[Kalvin00]

Yes, I believe alkalines are 600-800 mAh.

 

[Imdmn04]

if they are rated less than alkalines, then why do many times from my experience do alkalines last longer than Nimhs for a one time use? With only one exception that Nimhs last longer in digicams, but thats about it.

 

[MWink]

Umm... Try looking at Energizer or Rayovac's site. They both list their AA's as 2850mAH (D's = 18000mAH). And as for how long they last, that depends on the drain. In a digital camera a NIMH will easily outlast an alkaline but in say a clock the alkaline will last longer.

 

[Eli]

Originally posted by: MWink
Umm... Try looking at Energizer or Rayovac's site. They both list their AA's as 2850mAH (D's = 18000mAH). And as for how long they last, that depends on the drain. In a digital camera a NIMH will easily outlast an alkaline but in say a clock the alkaline will last longer.

There is no such thing as a 2850mAh AA alkaline battery.

There is also no such thing as a 18Ah D cell.

Do you see double? 😛

 

[Eli]

Ok, well.. I looked at their site, and it does indeed say their AA alkaline cells 2850mAh..

What a blob of poop. 😛

You also have to take this into account:

* Typical capacity rating based on 25 mA continuous current drain to 0.8 volts cutoff per cell. See datasheets for details.
For active JIS numbers , refer to IEC.

Somehow I don't think that's the standard way of measuring capacity...............

There is no way that an AA alkaline cell could supply 2.8 amps for an hour.

Even NiMH cells are only at ~2400mAh max right now. And as we all know, NIMH cells have a higher power density than alkaline.

But you're right in one aspect.. rechargable batteries lose their charge a lot faster over time than alkaline cells do, so they would be much more appropriate for something like a wall clock.

 

[LordThing]

So, basically the consensus is that Alkeline batteries retain their charge longer than NiMH rechargables, but the NiMH have a higher capacity and therefore have a better strength in power hungry applications (CD players, radios, Gameboy) but they suck in longevity applications (like remotes, clocks, etc).

 

[brxndxn]

In high-drain devices, often a NiMH will put out much more total power than an alkaline. In low-drain devices, an alkaline will often put out more total power than a NiMH because NiMH batteries tend to lose their charge faster over time than alkaline.

No matter how many NiMH batteries you get, you're gonna want a few alkalines around. It would suck to have to change the batteries out of a remote control every 2 weeks.

AA Nickel-Cad batteries are 600-800mah. AA NiMH are 1250-2300mah. Alkaline batteries are more variable.

 

[EyeMWing]

Originally posted by: Eli

Originally posted by: MWink
Umm... Try looking at Energizer or Rayovac's site. They both list their AA's as 2850mAH (D's = 18000mAH). And as for how long they last, that depends on the drain. In a digital camera a NIMH will easily outlast an alkaline but in say a clock the alkaline will last longer.

There is no such thing as a 2850mAh AA alkaline battery.

There is also no such thing as a 18Ah D cell.

Do you see double? 😛

I believe the biggest battery I have ever held in my hand was a 5Ah NIMH Sanyo D-Cell w/ solder tabs. $20. FOR ONE. I plan on getting 4 more and using them with my digicam as an external battery pack.

 

[Eli]

Originally posted by: EyeMWing

Originally posted by: Eli

Originally posted by: MWink
Umm... Try looking at Energizer or Rayovac's site. They both list their AA's as 2850mAH (D's = 18000mAH). And as for how long they last, that depends on the drain. In a digital camera a NIMH will easily outlast an alkaline but in say a clock the alkaline will last longer.

There is no such thing as a 2850mAh AA alkaline battery.

There is also no such thing as a 18Ah D cell.

Do you see double? 😛

I believe the biggest battery I have ever held in my hand was a 5Ah NIMH Sanyo D-Cell w/ solder tabs. $20. FOR ONE. I plan on getting 4 more and using them with my digicam as an external battery pack.

Hmm, that doesen't really seem very impressive.

I know Powerex has 7.5Ah D cells.

But it's still a far cry from 18Ah.. Energizer should be ashamed of themselves. But I guess any company is going to use testing methodology that makes them look better if they can.

 

[EyeMWing]

Originally posted by: Eli

Originally posted by: EyeMWing

Originally posted by: Eli

Originally posted by: MWink
Umm... Try looking at Energizer or Rayovac's site. They both list their AA's as 2850mAH (D's = 18000mAH). And as for how long they last, that depends on the drain. In a digital camera a NIMH will easily outlast an alkaline but in say a clock the alkaline will last longer.

There is no such thing as a 2850mAh AA alkaline battery.

There is also no such thing as a 18Ah D cell.

Do you see double? 😛

I believe the biggest battery I have ever held in my hand was a 5Ah NIMH Sanyo D-Cell w/ solder tabs. $20. FOR ONE. I plan on getting 4 more and using them with my digicam as an external battery pack.

Hmm, that doesen't really seem very impressive.

I know Powerex has 7.5Ah D cells.

But it's still a far cry from 18Ah.. Energizer should be ashamed of themselves. But I guess any company is going to use testing methodology that makes them look better if they can.

I saw those. $100 for a battery pack is plenty, and it should easily last a whole day. I get about 2 hours of picture taking time on one set of 4 1200mAh NIMH's. The extra voltage from the 5th battery will bring focus speed up to the level that the AC adapter provides (4x 1.25v =5v, 5x 1.25v =6.25v, AC adapter = 6vDC And what's .25v to some DC hardware? Nothin')

Then there's the issue of cannibalizing a charger to charge the BeastPack.

 

[Eli]

Originally posted by: EyeMWing

Originally posted by: Eli

Originally posted by: EyeMWing

Originally posted by: Eli

Originally posted by: MWink
Umm... Try looking at Energizer or Rayovac's site. They both list their AA's as 2850mAH (D's = 18000mAH). And as for how long they last, that depends on the drain. In a digital camera a NIMH will easily outlast an alkaline but in say a clock the alkaline will last longer.

There is no such thing as a 2850mAh AA alkaline battery.

There is also no such thing as a 18Ah D cell.

Do you see double? 😛

I believe the biggest battery I have ever held in my hand was a 5Ah NIMH Sanyo D-Cell w/ solder tabs. $20. FOR ONE. I plan on getting 4 more and using them with my digicam as an external battery pack.

Hmm, that doesen't really seem very impressive.

I know Powerex has 7.5Ah D cells.

But it's still a far cry from 18Ah.. Energizer should be ashamed of themselves. But I guess any company is going to use testing methodology that makes them look better if they can.

I saw those. $100 for a battery pack is plenty, and it should easily last a whole day. I get about 2 hours of picture taking time on one set of 4 1200mAh NIMH's. The extra voltage from the 5th battery will bring focus speed up to the level that the AC adapter provides (4x 1.25v =5v, 5x 1.25v =6.25v, AC adapter = 6vDC And what's .25v to some DC hardware? Nothin')

Then there's the issue of cannibalizing a charger to charge the BeastPack.

Whoa.

After a quick search on eBay, I foundthese 9Ah D cells! :Q

You should use those. That's almost double the capacity of your 5Ah cell idea.