When I decided to buy my new electric bike, I researched the various options available. I must admit that the power tube option it’s a very sleek and stealthy design. I chose a bike with the power pack battery, though, because I found the power tube battery was a little tricky to get in and out of the bikes I researched and tested. The frame mounted battery was much easier and quicker to get on and off. Before purchasing a new e bike, I had decided that I would need two batteries. One power tube battery is not the easiest thing to carry in the house for charging, much less two. I can put two power pack batteries in one hand and still get into the door of my house without setting the batteries down first. The little handles on the power pack batteries also reduce the chance of dropping the batteries when I’m transporting them. The electric bikes I was considering did not have dual battery capabilities, therefore I would be carrying one of the batteries in a trunk bag attached to the rear rack of a bike I purchased. I found that the power tube battery was a little long for most standard bike trunk bags. The power pack battery, on the other hand, fits easily into standard bike trunk bags. I eventually did purchase an electric bike with a Bosch power pack battery. I also purchased an extra battery that I carry around in the trunk bag mounted onto the rear rack of my bike. By the way, I got a really good deal in a new second power back battery. A second power tube battery would have cost much more. So far, I’m very happy that I purchased an E bike with the power pack instead of the power to battery. Ed