Nowadays it is common to carry a powerbank. I take a 20000mAh version from Anker. I just wish it could be lighter as it weights a whole 350g. But it carries a mobile phone, a headlamp and a smartwatch for 5 days of charge, which is really useful. It can also charge some camera equipment.
I also need three kinds of cables:
- USB-A to USB-C: Charges most things nowadays.
- USB-A to Garmin: Fenix models have good battery life, but when recording a route the whole day, they will need a charge
- USB-A to Micro USB: Somethings like the Petzl headlamp needs this.
It all goes in a Sea To Summit Ultra-Sil drybag.
- https://www.anker.com/products/a1268?variant=37438338695318
- https://seatosummit.eu/products/ultra-sil-dry-bag?variant=42398588829846