The 3V CR123 Streamlight Lithium Battery is the best as a replacement for any standard 3-volt (123 CR123 123A) lithium battery. These Streamlight Lithium Batteries are extremely popular for the flashlights and digital camera use.
Iprotec RM400LSR Rail Mount 400 Lumen Green Light, Red Laser Combo
The RM400LSR is a rechargeable light and laser combo designed specifically for rail-mount equipped firearms. The RM400LSR features 400 lumens of green light, 6x adjustable zoom and a sightable red laser.
Surefire 6PX Tactical Single-Output LED Flashlight 600-Lumen Black
SureFire's 6PX Tactical LED flashlight is designed specifically for tactical use, and it uses a high-efficiency LED to generate a brilliant, penetrating, perfectly pre-focused 320-lumen beam.
Streamlight, TLR-6, Weaponlight, Fits S&W M&P Shield, White LED 100 Lumens, Black
Based on Streamlight's popular ultra-compact TLR-6, this non-laser model is designed to securely attach to the rail and trigger guard of many popular handguns.
Intensely bright, virtually indestructible rail-mounted tactical light, attaches to almost any gun in seconds.
Powered by two 3-volt CR123 lithium batteries with 10-year storage life.
BLEM NcStar 150 Lumen LED Compact FlashLight QR w/Strobe
This Item has some scuff on the battery cover and the rubber strobe button cover has fallen off, see the pictures for details on the item. Strobe is still functional, but needs to be pushed with some object. Rest of the light will function normally.