My Woosh conversion on the hybrid is dead easy. Turn a key, slide it up and forward an inch and it lifts off. Putting it back is the exact reverse. Takes about 5 seconds. The downside is it's one of those ugly black plastic lumps on the downtube, but I don't care about that it's just a commuting tool.
The Cube is a right faff. Battery compartment is accessed from underneath the downtube so you're bending down or kneeling. Push a button and remove the plastic cover. Insert and turn key. The keyhole is angled so it often takes a couple of goes to get the right angle. Battery pops out a few mm. Then press a catch to release the rest of the way, with a hand ready to catch it.
Getting it back in is worse. Locate bottom of battery onto contacts. Only goes in one way but you need to look at bottom of battery to work it out (makes mental note to put stickers on it next time), then push top of battery in until it clicks. This usually takes a couple of tries as the bottom might not be located right. Then you need 3 hands as you need to turn and hold the key while you push the battery in fully. Finally clip the cover in place and you don't always get the bottom tabs in the right slots first go either. 😩
Or, just plug the bike in!
Don't get me wrong I love the bike it's superb in just about every other way.