No Energizer Lithium AA cells in Tk40..what gives??

[Larbo]

I just visited the 47's web site and saw this message in the TK40 section Do not use Energizer Lithium AA cells for this light. Anyone know why?? I think Iam gonna give them a call Tuesday and inquire about this as alot of people use these batteries....

 

[JeffInChi]

ASAIK it's not recommend by Fenix to use lithium batteries in the TK40 period, at least not for long term use.

 

[Flic]

I just visited the 47's web site and saw this message in the TK40 section Do not use Energizer Lithium AA cells for this light. Anyone know why?? I think Iam gonna give them a call Tuesday and inquire about this as alot of people use these batteries....

There are references to this issue in the following thread:

http://www.candlepowerforums.com/vb/showthread.php?t=241839

People may use them, and you may call but per the manufacturer Lithium primaries are not specified for use in the TK40.

 

[Larbo]

Its just I dont remember this on their web site telling NOT to use em, seems like its something new...or maybe not.

 

[Larbo]

Update:
Reason I was given was the voltage was too high with lithium cells. I measured and averaged the voltage of 8 cells with a date code of 2023 and got 1.80 volts, I guess 7.2 isnt good for the light but what about the regulator?
Botton line for me is I wont use them in my $150 torch...dont want to it.

Voltages were
1.795
1.806
1.816
1.788
1.812
1.805
1.797
1.801

 

[MichaelW]

I wonder if EA91 would perform better in the TK40, and by better I mean worse, would could possibly be safer.