[CodeWriter23]

The weight option has the benefit of durability. A battery needs to be replaced after x charge/discharge cycles. The goal of GL is to reduce poverty cycles by making a one-time investment that pays for itself in a month. Adding the recurring cost of a battery, even if still cost effective, runs counter to that goal.

[makomk]

The weight option has lots of moving parts under tension from about 10kg of weight hanging off the mechanism. That's going to present its own durability problems, and the parts are going to be a lot harder to obtain and fit than a new battery.