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

Input:
Question: How long should the battery last?  Is there any warranty on the battery?
Document: The Olight SR90 is currently the brightest LED light commercially available, though that will surely change in time. It is an extremely solid, well-built light. It is heavy, so if using it for an extended time, the included shoulder strap comes in handy. Considering the brightness, the battery time is surprisingly long at over an hour on the high setting.
The question here is one of need. If you find yourself NEEDING a light that casts a reasonably focused beam over long distances than you've arrived. I don't want to repeat the battery longevity lines written over and over in these reviews other than to say I concur with the assessments. The light is sizable and weighty so lugging this pup around is a consideration. You wouldn't want to throw this into a tool bag because, as with all lights, if you mar the lens you scatter the focus and will lose luminance.
I loved it so much I bought two more as gifts. Look around the prices vary, I was able to get the last two for a hare under three hundred ea. with shipping included. If your going to use this alot, buy the extra battery, you will be glad you did. I strongly reccomend this light, I rsearched it and too many others to count, this is it.
I recieved this light on 4/9/2014 and was super excited to try it out. The thing is a beast and seems put together decent.So I put it on the charger and let it juice up. Once charged, flip the switch and I'm basking the neighborhood in brilliant blinding light. Awesome! After letting it run for a few minutes I turned it off...and that's the last time this light worked.
You might not have $30 million to buy a jetliner, but if you buy this light, you can make it look like you're landing one. I wonder if Lawrence Livermore / National Ignition Facility has considered an array of these to help initiate hydrogen fusion? Or maybe redirect high earth orbit satellites equipped with photon sails?What I really dig about this light is the highly collimated beam (long throw). It's neat to have in hand what is essentially a portable 4-inch spotlight.
I use this thing a lot. I find it better than a battery QBeam. The price is a bit higher but the charge is well over 2 hours of constant use for me.
WOW!!!!!!!!!!!!! thats all i got to say. if you need sun light this is it the intimidator rocks never seen a l.e.d flash light with a bad ass caring case it has it allfrom battery charger to a shoulder strap and much more.
Do not drop the light (glass lens). What kind of silicone to use on the o-ring? Battery is expensive to replace if needed or buy an extra. No lens cover either.Update- 7-11-2013; light died and I had to call CHINA (where made) to get someone to try and fix un warrenty.
At full power it will run over 1 hour, and has adequate heat sinking so that it can run at full power continuously. The tail cap has a nice indicator that displays battery power remaining.The Olight SR90 is highly recommended for anyone who needs a big powerful searchlight with high quality of design and construction.
I love this flashlight, not only is it bright as day inside its beam but it carries farther than I can resolve detail. As I charge it up after each use and I do use it a lot as I live in a semi rural area and lots of things go bump in the night, the battery seems to hold longer a little better each time I charge it.
Answer: no