I have gone a bit nutty... yep, in my constant search for better and better product, I have found some MS (military spec) lipo batts...and made an order. From what I have read, it would be hard to buy better.
The good news is they are lighter for same capacity. I have ordered some 1350mAh's, that claim to be the same weight as my (small) 1000mAh battery... they also have a claimed 160g / 2000mAh battery as well...now that's light for 2000mAh...
basically its 'extra run-time for no added weight'  Hhmm now that's handy!! I will be testing them first, before I pass them on to the test riders.