Alkaline vs Lithium in the EOTech 512

I don't see how they would make a difference, the battery only charges the capacitor, the laser don't run on battery directly.

is that an Ithica Deerslayer…..?

Lithium all the way. No brightness difference but much longer life for sure.

Not sure why you'd want brighter??
Hell my Eotechs will make my eyes hurt if shooting long range where it takes hold and precision instead of pull up and fire, Too want it brighter is Nuts, Also makes MOA of Retical larger from distortion when cranked up

You should not see any difference in brightness.

I have an EOTech EXPS3-0 that uses a single Lithium 123 battery. Have never had a problem with it, and still have yet to change the battery out. The brightness settings allow the reticle to become ridiculously bright, but I also don't know if there is a real brightness difference between the two different types of batteries.

I guess run alkalines, stockpile lithiums

Don't forget the biggest expense of using alkaline batteries, they leak when least expected and corrode all the electric contacts . This may destroy the expensive optic and also the running time of most dot sights is very long which further increases the chance it might leak since the battery is rarely replaced.

Order some AmazonBasics rechargeables, the white ones, not the black, they are rebranded Sanyo eneloops, which are the best rechargeables you can buy.

AA "Lithium" batteries (Li-FeS2) like the ones you used and AA "Alkaline" batteries have the same nominal voltage (1.5V) so you shouldn't see a difference in brightness between fully charged batteries of either type.  Where this type of lithium battery rules, though, is in the total capacity.  At a constant 500 mA drain, alkaline batteries will hold 1800-2600 mAh versus lithium batteries with somewhere between 2700-3400 mAh.  In high-discharge applications, you can see up to 2.5x longer life with the lithium cells versus alkaline.  They also store better due to much lower self-discharge rates (think storage in the 10-20 year range with little to no effect on capacity).

Also, don't confuse these "Lithium" cells with the CR123A lithium batteries often used in high-brightness flashlights (think "Surefire") and such.  The CR123A uses a Li-MnO2 chemistry, producing a terminal voltage of 3V (instead of 1.5V as with the Li-FeS2), and work better in low-drain applications.  They don't like high current drain applications, but can deliver brief "spikes" of high current effectively.  The CR123A will also self-discharge at high temperatures so are more critical of storage.

Looks the same to me.

I noticed in the paperwork for my eotech that the lithiums dont give a low battery warning flash like the alkalines. bought mine new over a year ago and havent replaced the batteries that came with so far.

i have regular akaline and at top brightness it hurts my eyes

Hilarious.  I think this was the least scientific study I've ever seen in my life.  What's heavier?  A pound of rocks or a pound of feathers?

I run nothing but lithiums in my 512 and never had an issue. 

The xps2 uses the 123a lithium 3 volts. I'm not sure what the power output is on AA

Maybe it's the type of battery. I'm in no way an expert, but what if it's the voltage? Are the AA batteries rated for 3 volts?

Lithiums will not leak , well worth the money .

they are both 1.5v's so there wouldn't be a difference.

You're killin me with the lack of 1k yard project.

Is there a Lithium rechargeable battery???

Is there anything you won't throw an EOTECH on?

Looks so wrong on that shotgun

Lighter, last longer a touch more expensive. IDK I run an XPS2 so I am waiting for the day it just up and dies. Then I will have to unzip my range bag and replace the Batt. I get more rail space with the XPS2 and that's the only real advantage I see.

Thank you for the information!

First!  Looked about the same to me but if you got that Iowa Farm Money I say go for the lithiums!