Instruction: Given a question and the related document, predict if the question is answerable based on the information provided in the document. Output only yes or no.

Input:
Question: some claim that cranking is not charging the unit, and that it's really running off batteries.  can someone attest to this? sounds like a scam
Document: These little crank flashlights may be small, but are quite bright. We are constantly running out of batteries and like most families we rob batteries from other things for our remotes, toys etc. so when we need a flashlight, we are out of luck. I placed one of these on each floor of the house plus each kid has one. they work fanstastic and the LED Lights really give off quite a glow. I am very pleased! !
Came charged. Initially impressive: look still working with hardly any charging. But once the battery ran down, it was down. Pumping the unit gets you light as long as you keep pumping. My battery did not recharge at all!
I really like these hand crank flashlights very light in weight and small but bright and only haven't had to crank them up yet...sick of buying batteries and everyone knows battery only last 1 year maybe more if sitting in a drawer
I got them on time & they work. At least 2 of the 4 do, I have not opened the other 2 yet. I like the fact they don't require batteries and the 2 I checked worked without cranking. I had several power outages before I ordered these, none since.I ordered another product designed to come on automatically when the power fails, but the outlet I had in mind for it is inconvenient due to something else plugged in there.
These little lights are extremely handy. I bought them to stash in various emergency locations. About the size of a deck of cards, they are 3-LED lights so they are not ultra bright, but they are fine for my objectives. They crank by squeezing the lever, which also locks into place. The illumination time is quite long - at least 30 minutes or more on one minute of cranking. I like crank lights as our regular flashlights always seem to have nonworking batteries whenever I actually need them.
I disassembled one of my flashlights and traced the wiring to learn whether this is really a scam as a few negative reviewers say. The answer is mostly "yes, it is a scam" but the flashlight does have its uses, particular at a very low price.This is actually two separate products in one: a disposable non-rechargeable flashlight and a hand-cranked flashlight. The on/off switch switches the flashlight between the two modes.
Have not had a chancr to really put it to the test but my wife loves it. She has one in her car in case of emergencies. Small and compact with powerful light. The brightness of the light when you are cranking it is not great but in a pinch it does the job.
However, because the generator isn't hooked up to the battery, you only have light while you are actively cranking. Cranking for any significant length of time is tiring and would only be useful in an emergency or if you were trying to build-up the muscles in your hands.Though the description of the product is misleading and most of the buyers misunderstand how it really works, this flashlight could still be useful.
Whether It Is An Emergency bag, Or In Your Car, Purse, Even For Camping. I love That These fit Into Your Hand And Your Hand Doesn't Get Tired From Cranking, Like When Using Some Other Brands. These Are Definitely Well Worth It!
I bought these for my kids since they love running the batteries out of my other flashlights. They were on for a solid 20 minutes before they had to be recharged. My 2 and 3 year old could charge it themselves. Good product.
Answer: yes