Indeed, they worked perfectly, and turned out to be sturdy and long-lasting. Two years after climbing Kilimanjaro, in 2016, I cycled for four months from Cairo to Cape Town, all the way through Africa. You can read all about it on Alex Cycles Africa as I was maintaining a daily blog. During my cycling trip, I used my RAVPower solar charger almost every day to charge my phone, e-book reader, GoPro battery, Garmin sports watch, headlamp and small external battery. The panels worked perfectly for such small devices, and kept up well throughout extreme climates.
Within one hour of direct sunlight, you easily get your small devices charged up close to 100% using the RAVPower 15W Solar Panels.
Please note, however, that it takes much longer to charge a tablet or larger external battery pack. Furthermore, solar panels are not suitable to charge a laptop computer. I had done significant research on this, spoken to Apple/Mac support, and bought the most powerful solar charger that was available in the market. Conclusion: Mission Impossible! The voltage is simply not strong enough to charge more powerful devices.
For smaller devices, however, I can highly recommend the RAVPower solar chargers and would buy one again.
Caution: My portable charger kept up well while cycling through Africa. However, while we did have very cold nights, temperatures never dropped below freezing. Batteries drain quickly in cold temperatures. If you use them on Kilimanjaro, makes sure to keep them in your sleeping bag with you over night to avoid drainage. I haven’t tested how well a battery pack would keep up on Kilimanjaro. In the unfortunate event that it drains completely, and if you absolutely must charge your devices while climbing Kilimanjaro, you will most likely be able to borrow a USB outlet from a fellow climber as solar chargers have meanwhile become very popular amongst Kilimanjaro climbers.
So, in a nutshell, think not only about the best solar charger, but whether you need one at all. An external battery pack might be a more useful investment for you.
I strongly believe that a Thermos should be on everyone’s kit list. From hot water warming your body when it’s really cold to a steaming hot towel in the morning, I promise you will love it. It’s absolutely worth the extra weight. Read more about all its fantastic uses on Kilimanjaro 
In our age of gadget addiction, solar panels have become unbelievably popular on Kilimanjaro. They are definitely worth the money if you plan to use your phone a lot, as I did to write my book! My panels worked like a charm and I absolutely loved them. However, they are a total overkill under normal circumstances. If just to take photos on your phone, you might want to invest the money into a decent camera instead. For most people, solar panels will end up in their cellars and never be used again. What a waste just for one trip!
Freezing overnight in my tent and during summit night was my biggest fear about Kilimanjaro. Of course I made sure to bring a stack of self-heating badges, i.e. air activated warmers that supposedly heat up as soon as you have opened the packaging and stay warm for several hours thereafter. I brought special hand warmers to put inside my gloves, toe warmers to stick to my socks, and even big warmers for my back. Conclusion: All of them were totally unreliable and – as a result – completely useless. The few instances they worked, they were far too hot. And when I most needed them, i.e. during summit night when I could no longer feel my fingers and toes, they didn’t work at all! I highly recommend you to invest in proper gear instead, like warm 
This is for women only. Surely you must have wondered how you will be able to pee in privacy. Blogs warn that at higher altitudes there might be nowhere to hide behind. Marketeers have jumped on this opportunity and come up with FUDs, short for Female Urination Devices. They promise the impossible: pee while standing, just like men. Theoretically, sounds great. Practically, I haven’t seen a single woman using them, nor was there any need to do so. Other than close to the summit, we always found rocks to hide behind; and even summit day won’t cause you any problems because you won’t drink much during summit night in any case. More about that 
