Hi Chris,
I’ve been the happy owner of a Powertraveller Powermonkey Extreme battery and solar pack for three years. It’s very robust and I find that if your requirements are just cell phone, GPS and camera (all must be 5V or 12V devices) and you spread your charging wisely, then your devices can be charged sufficiently to function for a number of days(depends on the amount of sunlight) The solar panel daisy chains with the battery unit so you can recharge it while the devices are charging from the battery. Charging up an iPhone6 from ‘low’ battery to full does draw about 50% of the battery but it’s relatively fast, it takes a few hours using the solar panel directly. I tend to use the solar to charge the battery and the battery to charge my devices. The solar panel also straps neatly to the outside of a back pack so it’s useful to charge the battery while hiking during daylight hours. So aim to keep the battery pack charged using the solar panel where possible. Overall, I’m very impressed with this product. It’s well worth spending the extra money for good technical gear.
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