On 30/12/2020 12:22, wrote:
Thanks - yeah saw these. Was hoping to improvise something so I
could get it running for a couple of hours.

Simplest way might be to find someone else with a similar S5 phone and
charge it in that (or buy a new battery for it and hope it comes with
enough charge to do what you want). eg

https://www.duracelldirect.co.uk/pho...y-charger.html

You are unlikely to bodge something up that will fool the self
protection mechanism inside the battery and might well brick it.
(or worse start a lithium fire)

--
Regards,
Martin Brown