AAA 350mA Question

[skalomax]

How well will a AAA battery (NiMh, Alkaline, Lithium)power a CC 350mA circuit with a XR-E?

Thanks

 

[legtu]

not too well...

even with a highly-efficient boost driver and a low vf led, current draw would be at least 800ma.

 

[paulr]

Alkaline: hopeless
Lithium: would work, but $$$$
NiMH: your best bet. There are some high current ones made for RC planes that could handle this very easily but even the regular ones should work ok.

 

[DM51]

A 10440 Li-Ion rechargeable should be able to handle this OK.

Are you thinking of modding one of these? Nice idea - let us know if you do it!

EDIT: Just for clarity, 10440 is AAA size.

 

[wakibaki]

This is only a Watt (1) which any of these battery types will provide for a time.

If this is just a constant current circuit, then you need enough voltage to drive the LED + the overhead (dropout voltage). In this case only the rechargeable 10440 will do and the circuit will drop out of regulation fairly early in the battery discharge cycle. Most white (3W) LEDs will survive direct connection to a small rechargeable lithium cell and the CC circuit will have negligible effect on runtime, so I'd just leave it out.

A boost or boost/buck regulator would provide operation from any or all of the battery types.

w

 

[LEDninja]

Here is chevrofreak's runtimes for the L0D CE. The high will be fairly close to what you are doing.
https://www.candlepowerforums.com/threads/152223
Energizer e2 lithium 1 hour 22 minutes.
Sanyo NiMH 58 minutes
Duracell Coppertop alkaline 17 minutes

I do not think Fenix is running the L0D CE at 350 mA. Probably more like 250 to 300 mA. So your runtimes will be less.

 

[jumpstat]

Should be ok. Liteflux LF2 using AAA and they are designed to run peak @350ma

 

[skalomax]

Ok, thanks guys!

Seems like ni-mh and Lithiums are the way to go as I suspected.

thanks again