need to be specific about which Vapcel… The Vapcel L10 and H10 Button tops are a problem, because they are 52mm and that is a NoGo length…
the flat top L10, 49mm long, does work in my TS10, the flat top H10 is 49.4mm and also works, but I dont recommend it due to the 10A discharge rate being known to burn out TS10 LEDs
The stock Wurkkos button top is 49.9mm long. and Wurkks 
Vapcel L10 and H10 flat tops and F12 Flat top 48.7mm (shortest and highest capacity) are all shorter than the stock Wurkkos battery, and they work great in a TiTS10, and also in the Original TS10 (that RichH has). the Button top F12 is 51.35mm and some people claim it works in the TS10 also.
fyi, RichH already got a warranty replacement… he is just trying to the revive the non working TS10 he did not need to return.
here are some batteries and their lengths, that work in a TS10:
here is a thread about TS10 batteries, that revisits what Ive posted above