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Make no mistake about it, this is an incredible portable light. It is on the expensive side, but much like anyting you purchase you get what you pay for, let me just start by saying that. Not only does it have great features like Bluetooth connectivity from your phone to turn it on and off, this thing last forever on a 9 amp hour 60 volt and Battery (on the lowest brightness, which is still plenty bright). I'm not sure how it will perform with a smaller battery, but I left it on all night once by accident and it was still on the next morning...again, that was on the lowest brightness with the my 9AH battery, but you get the point.
I've used it on the brightest setting and it still last a really long time. I've gotten at least 8 hours or pretty close to that on a full charge. LOL, once again I haven't used anything smaller than a 9AH battery.
I don't want to make this an extremely long review but this DeWalt light is exactly what you need. So, if you can afford it, go for it, PERIOD!!!
Awesome light for the mechanic shop, lights up the entire underside of a vehicle. We use it in the shop and on service calls. Battery life depends on the size of battery you are using, do a little research on dewalt batteries before you buy. Some are better than others, but of course they get more pricey the bigger you go!