Holy shit! Walgreens had a 2 pack of energizers for 15!! I got ripped.
Get an 18650 lithium ion rechargable and a charger, if your flashlight supports that battery type (basically, like two 123s stacked on top of each other). Then, no more worries. Just charge and go...
You can get rechargeable RC123s as well. If you do go for rechargeable no matter what size I recommend AW brand. They are rated less mAh but they don't inflate their stats. I guarantee they will out last any other brand ratted higher. I like to get mine from lighthouse.com good service and fast shipping as they are located in Houston.
Pain is inevitable. Suffering is optional.
Yes, but your light must support the extra voltage.
A primary 123 is 3 volts. A rechargable 123 is 3.7 volts, but is actually close to 4.2 when completely charged.
2x3=6
2x4.2 is 8.4. You will blow many LEDs if they don't support this. My Lumapower Trust 2 does support them, so I have them in that light.
The 18650s are 3.7v (4.2 totally charged). But, there is only 1 of them. So, you won't blow the light.
Just an FYI
Streamlight 12 pack for under 21 bucks shipped.
Amazon.com: Streamlight 85177 CR123A Lithium Batteries, 12-Pack: Home Improvement