'Splain me 'bout solar chargers...

[RAMd®d]

If it was me and I was camping (which I don't) I'd take a BA power bank that would/should just outlast the duration.

If I was hiking (which I don't) I'd take a very light power bank which would/should just outlast the duration.

If I was going on a three-hour tour (which I'd never do) I'd take both.