are you located in US or UK ?
unfortunately i was unable to find a hcbn01 battery.
instead you can use two AA (LR6) alkaline batteries for your device.
you can buy recharceable alkaline NIMH batteries from amazon
to be able to charge these batteries, you can buy this recharger
i am out of ideas, let me opt-out now, and redirect this problem to another expert.
if nobody opts-in back, we can continue again.