Personally I usually avoided chargers with falling weights
Drawbacks I found during testing these are the following:
1. If the string holding the weight is too long it will invariably fall on your toes - not good for hiking purposes:
2. The necessary weight and length of cable may be so long that you need a truck and a really steep hillside to generate enough with power - found this in practical tests being to ... yes impractical :deadhorse:
Please enlighten me on the advantages with the clockwork camera charger
Seriously - Hasselbladf once had a handdriven charger for powering 2000 (I think it was this model) cameras. No more available - otherwise all the H1/2/3/4 shooters would have seriously strong handshakes