Do you happen to know how much current your H53 draws on H1 using a 14500?
I do not.. and did not keep the light, so cant test
the official current limit for a 219b is 1.5A, and a typical 14500 has a 3A CDR
that chart is from this
219b datasheet
but I dont think your 2021 H53Fc will allow a full 3A to reach the LED. My hunch is the Zebra driver wont exceed 1.5A on H1.
I say that because the Texas Ace test (thanks for the link), shows 3A direct to the 4500K 219b LED would give 643 lumens, which does not actually happen in the 2023 Zebra H53Fc N (with a 4000K 519a).
The 4000K 519a in the 2023 H53Fc N actually maxes out at about 420 lumens (the 519a
datasheet says that output would come from a
1.4A current)..
The Texas Ace test of 219b 4500K puts 413 lumen output at 1.5A (green arrow)..
So imho, If you were to try a 14500 in your 2021 H53Fc w 3000K 219b, I dont think it will receive the full 3A from a 3A CDR 14500.. My guess is the output will max out around 300 lumens, and the current would be no more than 1.5A from the Zebra driver on LiIon. That would not exceed the official spec of 1.5A for max current to a 219b. (The Zebra driver may actually limit H1 to just 1A)
I suggest you ask
@Bob_McBob whether he thinks it would be safe for the 3000K 219b to use LiIon in the 2021 H53Fc... He might be able to tell us if the Zebra driver limits H1 to 1.5A or less.