I think as the market for ebikes expands rapidly, there will be new players coming in to the matket. At least, we can hope.
Or Giant will make backwards compatible batteries of a higher wattage.
Thanks for that swift reply. I may be remembering incorrectly, but I had been looking at another thread for a booster battery (probably don't make them for my Giant anyway though!) I thought a contributor had said that the booster is about the same weight as a full water bottle.
Maybe one day...