Instruction: Analyze a question and its supporting document. Predicting answerability based on the information provided in the document. Output yes if the document contains relevant information to answer the question, otherwise output no.

Input:
Question: Are companies that sell LiFePO4 batteries online that risky? What amh is best for 48 v battery, 10, 12, 15, 20 etc?
Document: I rode around for about 5 miles and my battery indicator showed 2/3 remaining. The best thing about this is that it's very quiet. The motor is very quiet and the clicking from the chain coasting is louder than the motor. I went cheap on batteries for now, and got 4 9ah sla batteries, and this makes it rather back heavy and top heavy. Forget using a kickstand.
The motor works great. Quite a bit of power. Handles a 240 lb. man no problem. Haven't tried it on any steep inclines but on what I have used it for it handles no problem. Using 4x12v 10ah batteries and think I'll make the investment for a LiFePo battery in the near future.
I just finished setting up my electric wheel, and this thing is awesome! I went with 4 12v 15ah, and they seem to be holding up extremely well. It does draw an extremely large amount of energy from the batteries if you don't pedal from take off. This wheel is extremely fast, so fast that I can't keep up. I have yet to see just how fast it goes, but it feels well above 20+mph.I would recommend this wheel to anyone who's interested in an electric bike.
With doing all that, it took me about 2 hours to assemble the kit onto my mountain bike, and I'd say it would take another  hour if you plan on connecting the pedal assist.Now the results -  The best that I got was 18 mph on a level street. So I'm nowhere near speeds that viper got, however, 18 mph unassisted is about as fast as I want to go on a bike anyway.
We have yet to test the bicycle as we are still assembling. I think the company needs to address the SPARKING issue from the batteries to the controller!! I had to do extensive research on the web and there is a simple fix and should be included in the kit! !
Forget pedaling! You can't pedal doing more than 20mph. If it makes you feel better, you can fake pedal, but you don't need to. Oh and for hills, lets see, I weigh about 220lbs, the bike weighs in at 110lb with motor and batteries, and I went up a 300ft steep grade without even using full throttle.Granted, I am an e-bike user, but the kit is self explanatory and easy to install.
First the kit -  Kit is fairly complete minus batteries and zip ties. The instructions are not much help, but it's pretty self explanatory. The rack has two holes that go onto the axle, and two holes that screw into a standard rack fit. I had to bend it at the top to make it fit (no big deal), and had to grind one hole open so that it can fit on the side of the axle with the wire coming out.
With that said, take your time and do it right and you will have an e-bike that puts out.
This is a really fun kit.On a flat surface the motor will get me up to 20MPH no problem.Tackles hills pretty well however going up anything greater than 45* grade and you'll have to pedal.Very simple and intuitive components.
The motors phase cables can not fit into the rack.Both of these things were very easy to fix however.UPDATE:I recently had a controller overheat on me. I contacted Aosom and had an immediate next day response saying that they would replace the controller free of charge and I should expect it in 3-5 days. Great Communication and follow through, thank you Aosom,
Answer: no