stupid question

[raggie33]

ok what last longer 2 aa alkiline bateerys or 1 123 litium? if ya can give times it would be vey cool

 

[Kiessling]

lasts longer with what?
LED?
driver?
bernhard

 

[raggie33]

just say
a flashlight with a 3 watt led

 

[IlluminatingBikr]

Probably the 2 AA's. They have a capacity of 2,565 mAh while the 123A only has 1300 mAh. I realize that the 123A is a lithium battery, but I still think that the 2 AA's would last longer.

 

[Kiessling]

stolen from Roy's runtime plots in the review section:

MadMax+ (Q3) on 2 x AA:

MadMax+ (Q3) on 1x123:

Now raggie ... tell me where this question is stupid? /ubbthreads/images/graemlins/smile.gif

bernhard

 

[raggie33]

cool thank you.looks like 123..s rock thats lot of power in such a small package

 

[Kiessling]

yes ... BUT this is a high-drain application, so the poor AAs cannot cope for too long. I do not know how this changes with converters that draw less current ... better ask someone who knows better than me ...
bernhard

 

[Pi_is_blue]

But 2 AA NiMH batteries of good capacity will easily outperform a 123a in high current draw situations (like the VIP on high).

 

[naromtap]

I was actually wondering wether raggie had the VIP AA Body in mind when he posted the question

 

[raggie33]

i was just wondering there so small but have very good runtime kinda cool if ya think about it.i have some good nimh 2

 

[Bullzeyebill]

Mr. Bulk says that the VIP will run brighter and longer with 2 AA NiMH's, than a 123 cell, or 2 alkaline AA's.

Bill

 

[naromtap]

[ QUOTE ]
Bullzeyebill said:
Mr. Bulk says that the VIP will run brighter and longer with 2 AA NiMH's, than a 123 cell, or 2 alkaline AA's.

Bill

[/ QUOTE ]

Longer aswell!? That is good news!

 

[BentHeadTX]

2 NiMH AA batteries will destroy alkalines or a 123 lithium in high current devices. My Powerex 2200mAH NiMH AA cells last well over 2 hours closing in on 2.5 hours while alkalines ran about 1.5 hours.

Can't beat throwing them in a charger so there is no guilt with playing... err... using your lights.

 

[georges80]

[ QUOTE ]
naromtap said:
[ QUOTE ]
Bullzeyebill said:
Mr. Bulk says that the VIP will run brighter and longer with 2 AA NiMH's, than a 123 cell, or 2 alkaline AA's.

Bill

[/ QUOTE ]
Longer aswell!? That is good news!

[/ QUOTE ]

2x2200maHr or better NiMHs will give around 90 minutes of runtime on HIGH on the VIP vs around 30 minutes for a 123.

At medium the runtime improvement won't be nearly as impressive since the current draw will be lower and the 123 will do a pretty decent job of giving its rated mAHrs.

Alkalines would be useless in the VIP on high - they can't sustain the high current draw.

george.