I wash and reproof my tent(s) every year before or after use I take good care of my gear, I do both the inner and outer, I clean the poles, scrub the pegs clean, wash the storage bags the lot. Don't forget it also keeps any mould / musty smells at bay and protects the fabric it's not just about waterproofing, anyway isn't it important to reproof the groundsheet which is also attached to the inner..? The previous two properties I have lived in have had a damp problem I've had to wash/rinse just about everything in toilet cleaner solution to kill the mould (esp. clothes), or/and bleach depending on what it is. I even had to wash my rucksack last year because it was musty smelling. I thought it would take ages to dry but it actually dried quite quickly on top of the rotary washline lol.
My Anker 14w panel puts out 500mA in sun at this time of year and half that when overcast. This is laid flat or on the back of my rucksack. Weighs 700g. It doesn't mind being rained on either. Charging your devices direct is the way to go if you can and clearly there's a crossover when solar wins over precharged secondary cells, or primary for that matter.
14w 0.5 amps can't be right (?) what voltage is that solar panel? Mine is 0.4 amps and I worked that out as 2.4w, and it doesn't weigh 700g either, why is it so heavy? I wouldn't carry a solar charger around with me that weights that much that's ridiculous. For comparison I have a 12v solar panel which is 15w and that is huge - not for camping!
I've used a Schottky barrier diode on the back of the solar panel. It's important to use the right diode some (most) of them lower the voltage. No regulation necessarily Li-ion batteries have built-in overcharge protection. Obviously ordinary NiMH batteries don't though but it doesn't really matter about those.
This is my mobile power supply The solar panel I'm using is rated at 6v 0.4amp / 2.4w. I've made a neat job of all this it's good. This pic has come out a bit over exposed, the one you can't quite make out to the left of the Nokia battery holder is a clip which is attached to a camera battery. I've got a new phone now I won a ZTE smartphone in a competition and I can use that to charge it's battery too. Not sure which phone to take now for my next trip perhaps both. I guess you can make out the LED volt meter I made.