I have two Pulse V2's, the first in use since December, the second since February. I bought 3 each additional black and translucent spare bottles for them. I prefer the translucent because it is much easier to see the fluid level in them. The problem is they seem to leak more often than the black ones. I had read about this from others before I bought them, but bought them anyway.
I've never had the two black ones I've used leak, but I have had recurring small leaks from the (only) one translucent I've used. What I found was the little pin that holds the flip up lever of the refill cap moves a little off center, so it sticks out a bit on one side of the cap. If I carefully press that in, the leaking stops for 5 to 7 refills. The pin doesn't seem to move very far and still sticks out a bit.
I'm not really even sure yet that pushing that pin is changing anything, but it has worked for a while four times for me. I had a couple of good looks at the system and can't figure out any reason why the bottle coloring would change anything regarding the sealing, all I can tell you is what I've experienced so far, so take this all with a large grain of salt
I've also thought about closing off the bottom opening under the bottle and using any ordinary bottle that fits. That's my plan 'B' if I ever run out of OEM spares.
The mod though has been good enough that I'm thinking of getting a third. The only little niggling down side I've found is the battery charge indicator is inaccurate, so that by the time it indicates slightly less than full charge the battery is actually only about half full. I can very easily live with that though specially considering how good the mod is in every other respect.
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