An extra battery doubles your range and fun. But it's pretty hard to switch and the human body does not have enough energy to use two haha jk but you really need to have a lot of energy to use up two. And a lot of time too because one full battery lasts about an hour of riding. Or if you're going to ride more intense you will need a lot of space. So yeah it's awesome to have it challenges the limits of my available time and energy and space. Three bad things are 1 it's hard to swap the batteries you have to unscrew the enclosure and unplug two connectors then reconnect the two connectors and then tuck it all back in and screw it all back on.. 2 theres a little silver sticker on it, that, if (when) it is exposed to moisture it changes to pink and that voids the warranty which is nonsense because now both my batteries have pink stickers just from normal use. I'm not having battery issues but that's just a way for wowgo to not have to deal with any battery related problems.. and 3 I forgot so it's probably nothing big. But there was one more thing.
Not exactly a quick swap battery but it's way faster than waiting for a full recharge.
The delivery was so quickly