Gordon, just to complicate matters. There are some modern packs that display fairly high IR and relatively poor performance at normal rates but improve substantially when they are pushed hard. Revolectrix 60C is one that does that. At least mine does. The IR is high at ambient but drops off more rapidly than other similar packs at temperature rises. Essentially the IR vs. Temp. curve crosses over other packs somewhere around 30-50deg C.
Not suggesting that is the case here as most brands do not show this effect, but it is worth being aware of. Waynes comment about the identical labels is spot on however.
Originally Posted by GordonTarling
Prof100 - just as I thought! I'll be having a conversation with the supplier tomorrow!