I figured I’d start a thread on good prices for batteries for things. I’ll start with the ones I’ve found, which are generally those the best price and good reviews. Please add any you find.
(all of these are Amazon Prime with prices of March 2016 unless otherwise noted)
CR123A Lithium Batteries
Tenergy Propel 40-Pack $44.49 ($1.11 ea)
Tenergy Propel 12-Pack $15.75 ($1.31 ea; purchase in late 2015 had expiration 2020)
Streamlight 85177 12-Pack $18.66 ($1.55 ea; no dates on packaging at all)
(I’ve bought both brands before; I initially thought the Tenergies I had were bad because my Aeon MultiSensor 6 kept eating the batteries every 3 days, but it turned out to be a bad sensor. The replacement sensor has run on the Tenergies for 2 months now and is still at 100%)
CR2 Lithium Battery
Tenergy Propel 10-Pack $15.69 ($1.57 ea; purchase in late 2015 had expiration 2020)
CR2450 Lithium Cell Battery
BlueDot Trading 10-Pack $6.99 ($.70 ea; no expiration date)
(These are $6.99 when Amazon sells them (camel^3), but they are currently out of stock this week)