Is the cheap Chinese Aliexpress solar panel made with a plastic cover or a glass cover? The plastic covers on my cheap Chinese solar garden lights get sunburned and fail soon. The newer ones have a glass cover and they stay working well for a long time.
The Li-Po battery has a very low price. Is it any good? The batteries that came with my Syma drones are good but cheap "replacement" batteries might be bad.
Hero is correct it's potted in epoxy, the bigger failure point on this cell would probably be if you left the solder joint exposed and it becomes corroded, but you can get similar 1W solar cells for about $1, only reason I went with a 0.6W cell is because I was on a tight $20 budget, with a bunch of other junk in my cart, so I actually needed the extra 15 cents I saved going for a smaller cell in order to cram as many things as possible into my cart.
As for the battery, I haven't really tested yet, I mean since it was only $2 I didn't really care too much, I'll give you an update hopefully in a few hours.