After a day of heavy rains, I decided to ride in today in the light mist. I have to say that the bike feels completely different and much better with 48V of batteries. I can keep up with traffic and the hills become much more manageable. The extra weight of the 12V lead acid battery isn't significant and the bike still feels very agile. I'm tempted to rearrange my 36V Bosch Fat Pack cells into a 55.5V 8.0AH pack to see if 55.5V feels better than the 48V pack now.