The Angel use a common  AA battery  Amazingly it provides 120 lumens from just one AA.

Specifications

4 stages of output, all microprocessor-controlled in this digital flashlight
- Wide voltage range (0.8-4.2v), which can be powered by 1 x AA or1 x LRBAA (lithium) battery
- Heavy-duty pocket clip, lanyard included
- Aerospace-grade Aluminum body, HA III Military grade hard anodized in natural
- Premium Q5 bin LED, lifespan of up to 100,000 hours
- Candle function, it can stand up on a flat surface as a candle
- Waterproof: IPX-8 standard

LED: CREE 7090 XR-E (Q5 bin)
Max Output: 200 Lumens
Reflector: OP aluminum reflector
Material: aircraft aluminum alloy
Finish: HA III Military grade hard anodized
Battery: 1 x 14500 li-ion rechargeable battery or 1 x AA battery
Input voltage: 0.8-4.2V
Switch: Rapid switch between Morse-on and lock-on with over 50,000 times life cycle.
Waterproof: IPX-8 standard
Dimension: Bezel diameter 20.5mm, body diameter (max) 21mm, Overall length 105mm
Weight: 55g
Operation Temperature: -25℃-60℃

Output & Runtime:
120 Lumens (Max Output), lasting for 45 minutes

Accessories:

This torch comes with a wrist strap and a belt holster. 
It comes packaged in a gift box .