The headlamps and flashlights listed here take AAA, AA or CR123A cells, a rechargeable 18650 or 21700, the maker’s own pack or a built-in battery, by model.
Who made the light?
Which model?
The battery it takes
As an Amazon Associate, What Battery For earns from qualifying purchases.
Light batteries by model
Headlamp and flashlight batteries by maker and model
Light
Battery
Black Diamond Spot 400, Storm 450, Astro 300
3 AAA or a BD 1500
Black Diamond Astro 300-R
Built-in 1500 mAh rechargeable
Petzl ACTIK, ACTIK CORE, TIKKA CORE
3 AAA or a CORE battery
Streamlight Stylus Pro
2 AAA alkaline
Streamlight ProTac 2L-X, ProTac HL USB
SL-B26 pack or 2 CR123A
Streamlight PolyTac 1X
SL-B9, 1 CR123A or 1 AA
Fenix HM62-T
One 18650 or 2 CR123A
Fenix HM65R V2.0
ARB-L18 18650 (Fenix’s)
Fenix TK21R
ARB-L21-6000 (Fenix’s)
Fenix PD36R PRO
One 21700 (ARB-L21-5000)
From each maker’s product pages. Other models may take a different battery.
Petzl’s CORE battery
Petzl rates its CORE battery at 1250 mAh and 3.6 V.
Common questions
Can I use a rechargeable 16340 in place of a CR123A?
Only if the light's maker lists a 16340 for that model. Of the lights listed, Fenix lists one for the HM65R V2.0 and rules it out for the TK21R.
From Black Diamond, Petzl, Streamlight and Fenix Lighting product pages, read on October 25, 2026. Checked against published data from Black Diamond, Petzl, Streamlight and Fenix Lighting.
See all 4 sources
Black Diamond product pages: Spot 400, Storm 450, Astro 300 and Astro 300-R headlamps
Streamlight product pages: Stylus Pro, ProTac 2L-X, ProTac HL USB and PolyTac 1X
Fenix Lighting product pages: HM62-T and HM65R V2.0 headlamps, TK21R and PD36R PRO flashlights
Battery sizes come from battery makers' datasheets and device makers' own manuals and help pages. Check your device's manual or the old battery before you buy. If anyone may have swallowed a battery, call the National Battery Ingestion Hotline at 1-800-498-8666 or your poison center at 1-800-222-1222 straight away.