In the spirit of hand-powered eco gadgets, the GettaGrip Musclephone needs 40 seconds of squeezing time to give the internal battery a full charge.
The advert doesn’t mention just how much talk time the squeezing gives, so we’ve no idea how good it is. The phone is really ugly, so it’d make sense to have a variation of just the hand-powered eco charger which you can plug into any mobile phone. However, if you lose or forget that charger, then you lose the benefit of being able to charge up your phone anywhere!
Source: Eco-Friend