Yes, you can switch between using the battery or the turbine directly to charge your device as long as there is enough wind.
We are confident in Trinity's ability to charge its internal battery or devices on its own, but theoretically you could connect a solar panel with a USB output to Trinity's mini USB input for faster charging.
Trinity has 5 LED lights (20%/40%/60%/80%/100%) that show the charge level of the internal battery.
Yes, Trinity has three settings outputs off/outputs on using battery/outputs on using turbine.
Yes, we designed Trinity so that the internal battery is easily replaceable.
Yes, Trinity currently has a waterproof rating of IPX6.
Don't see the answer to your question? Ask the project creator directly.