The battery on my bike is perhaps 2 kg with the bike in total perhaps 26 ish. Removing the battery does not help except for hosing down a dirty bike or preventing theft of the battery.

In Europe a lot of the Bosch/Yamaha bikes have the so-called 'walk mode', where you hold down a button and the bike powers itself up whatever slope at walking pace.

For some reason I understand this mode is illegal in the US, but it makes all the difference over here - especially when going up stairs (or other 45 degree slopes).

Or an aluminum frame that can deal with being banged around a little.