Instruction: Output yes if the supporting document can answer the given question. Otherwise, output no.

Input:
Question: what type of battery is inside ? Li-on ? ( best),  Ni-Metal (not good) ? or NI-CD ( worse)
Document: The best performance I've seen so far is after a full day of sun. I've seen 5 out of 6 turn on (without having to press the button) and stay on until about 2am. I like the design. Water doesn't seem to sit on top, however there does seem to be some moisture build up inside the outer casing. Overall, I wouldn't buy them again. I'd go for a low-voltage solution (and I think I will in fact do that this spring).
These lights provide a nice ambience for my patio and stonework. However, an object is only as good as its weakest point and three of the Solar Ray lamps broke off at the point where the lamp is joined to the metal staking poles. After the winter I would wake to see additional lamps broken off and laying on the ground with the poles still erect. The lamps are joined at this part with a plastic insert that severed without provocation.
I have ordered 2 sets (6 lights). I was suprised that there was no manual/instruction sheet. I have installed them and they look very nice. All of them lit first day,  but one didn't the next day. I am planning on replacing the rechargible battery before I call the manufacturer(I don't even know who the manufacturer is as I don't any instruction sheet). The fixtures give nice ambient light (not so bright) but looks beutiful. The stakes are not of good quality.
We love the look of these, the shape is very appealing. I don't like that they are all plastic, would have been nice if the shafts had been metal, ours are plastic.
Of 3 lights, 2 have broken. Of those 2, 1 broke in two places, 1 broke in one place. The head has a descending segment that fits inside a hollow aluminum tube, and an orange stake fits inside the bottom of that tube. The orange insert broke in two lights.
Nicely finished unit. Batteries could have lasted longer than anticipated. Britta Products were very proactive to replace battery upon request. Would order this product again.
Had trouble at first but company sent replacwments immediately. I would bookmark this vender as the best I have ever dealt with.
This brings me to why it got only 4 stars and not 5. If the post and stakes on these were heftier, they wouldn't break off so easily. Yes, it would make the units not very attractive though. In that case, they need to be metal stakes. They break off at the stake to post joint on the plastic part.
I will post details in a few days.UPDATE: 8/31/2013These are the best looking solar lights I ever bought. They are still working except the one I had problem two years back which I removed it.
Nice lights. the poles are not made of the strongest material but They do put out good light on a path.
Answer: yes