onboard power for modern soldiers has been an issue that was identified about 8 years ago, so its been a work in progress for nearly all the countries developing future soldier conceptsIll have to look further into it, But quite an interesting idea that makes a lot of sense considering the amount of electronics our forces use these days.
The Australian Army Is Creating Solar-Powered Soldiers | Gizmodo Australia
Integrating solar power into the troops standard kit with the intention to power all the various devices and if I understand correctly possibly in future remove the need for batteries or at least reduce the amount needed.
eg 7 years ago the US tried to bring in common battery packs for all their manportable gear, the french were developing portable fuel cells, australia was working on large ceramic fuel cells and conformal solar panels - so things have come a long way. its also resulted in new constructs - eg software driven comms in areas where prev multiple radio types were needed.