Acebeam H40 battery voltage?

I’m new to flashlights, and I bought an H40 headlamp, and I could use some help with battery choices.

The H40 can use a AA battery, or a 14500 Li-Ion battery, but I’m not sure about voltage.

It looks like a traditional AA batteries are 1.5V.
When I looked for the top brand 14500 Lithium-Ion many people pointed to the various VapCell choices, but they look like 3.6V.

I looked over the product page at Acebeam, and I emailed them (no reply), and I can’t tell what voltage Lithium-Ion batteries I can use. I bought the EBL batteries on Amazon, but they don’t work for Turbo (double-click the switch and you get Turbo for about a half-second then the light shuts off).

So questions.

  • what voltage Li-Ion 14500 batteries can I use with the H40?
  • if the VapCells are a good choice are there any US sources?

Ideally, I’m interested in buying two types of batteries - long-life, and high-output.

Sorry for the beginner questions and thanks for any help.

I’ve received my h40 sst20 version this week.
I use the Keeppower 14500 840mAh (protected) - 4A button top without any problem so far

Never buy li-ion from Amazon unless it’s directly from a reputed flashlight brand (like… their own branded cells) and don’t buy EBL at all.

If you are willing to share what country you’re in we can list many reputable sites to order batteries from.

Li-ion are 4.2V when fully charged but 3.6/3.7V is the “nominal voltage” which is what is always the metric listed for them and other rechargeable chemistries like LiFePo4.

Thank you for the answers, it really helps.

I am in the USA.

If the Keeppower work then I think that answers my voltage question. I can use either the 1.5V Alkalines or the 4.2/3.6 Li-Ion batteries.

Only question is which Li-Ion battery and which US retailers.

Thanks again!

illumn.com is my favorite, and liionwholesale.com is solid as well.

This new cell is 1000mAh and is rated for high enough drain to supply what the H40 needs at turbo.

I would strongly advise against using alkaline cells. Lithium primaries (disposables, Energizer or Duracell “lithium” versions) or NiMH rechargeables are highly preferable.