![Long Range Green Laser Pointer High Power,[Material Upgrade] Laser Pointer Pen，[2000 metres] Green Lazer Pointer Rechargeable](https://images-na.ssl-images-amazon.com/images/I/713EWolDmCL._AC_UL160_SR160,160_.jpg)
Performance data later in review...
update: more info on battery, no change in evaluation.
I wouldn't want it more powerful because of danger of eye damage in casual use. It is easy to get your fingers in front of the beam while handling, particularly rotating the "star cap" (what they call it in the little slip of paper that passes for instructions). Even the flash of light scattered by an errant finger is uncomfortable to the eyes. The "star cap" gives a nice adjustable pattern of dots that was visible, at night, on the mountain behind the house, out to around 300 yards. If the neighbors were looking out, they'd have noticed it. The cobweb of small beams was slightly visible in the air out a few yards.
Late afternoon, overcast, the laser spot was visible out past 100 yards, particularly if hitting anything green (leaves). The beam, in the air, was not visible. At night, the spot is easily visible out past 600 yards, and very faintly visible on the side of a mountain across the valley (at least a mile away, probably closer to two miles). This mountain is fairly dark and gravelly, little vegetation, so not a great reflector. The beam was very nicely visible in the air out to around 300 yards (determined by whether it reached the spot it cast on the side of the nearby mountain at distances I've ranged in the past). The lower part of the beam, near the observer, twinkled as dust particles passed through it. The evening was damp (for the desert), and the air fairly clear, from an earlier small rain shower. There were scattered clouds at not a great height, and I saw no indication of a spot on the clouds. Unfortunately, I don't know the cloud height; they were not unusually low - aircraft in the outer approach were below them, so thousands of feet. Those rocks that showed the spot out to 600 yards and beyond are a dusky dark red, from desert varnish, so not great reflectors.
I wanted the laser for night-time "star pointing", and it is plenty bright enough for that. It would work for casting a spot for pointing out details on fairly large structures during the day, much larger at night. The "star cap" is amusing.
The included 18650 battery had at least a partial charge, and after perhaps a minute of initial testing of the laser, was at 4.05 Volts. It took just under two hours to charge up to 4.2 volts, on a Nitecore digital charger, using the "low" 300 mA charging setting. I expect this is due to the battery never having been charged since manufacture. Subsequent charges have been much faster. It appears to be a typical inexpensive Chinese 18650 cell, and will likely give reasonable service, for what it is. Comparing it to other 18650 cells, it appeared to be lighter, and indeed weighed in at 34 grams, while a comparable Chinese 18650 cell weighed 41 grams (less weight = less "battery material" inside to store power). It was also slightly smaller in diameter, perhaps 1/2 mm, though the same length. The laser will accept "full-girth" 18650s, and this cell works where other ones will, just with a very little more side-to-side "play", so no demerits there. It is marked as 1800 mAh, which is reasonable, derating a Japanese/Korean 2500 mAh cell by the weight difference. Kudos for truth in labeling, where exaggeration of battery capacity is common-place.
I did not use the included charger, except for a brief test. It looks exactly as the Amazon ad shows (everything, including the flimsy but usable case, matched the Amazon ad exactly). It appears to glow red while charging and transition to green when complete. I did not allow a complete charge cycle to complete with it. It appears to work best with the battery inserted before it is connected to a USB power source (I would NOT use a computer USB jack - best to use small phone or device chargers with unknown devices). The battery, at about 4.13 V (nearly charged), drew just over 100 mA from the charger. I have no idea how it ends the charge cycle, whether it turns off completely, or trickles the battery in an undesirable way. (It puts out around 4.3V, somewhat variably, open circuit.) If you have no other charger for 18650 batteries, and have to use it, keep an eye on it, especially the first time or two charging. The charger base lists input as 5V / 1-2 Amps, and the output as 4.2 V / 1,500 mA. These are clearly regulatory maximums. Final note on the charger: it does not hold the battery securely, and has a strong spring (likely to accept smaller batteries). It will easily "launch" the battery, something that happened to me more than once as I tested it, even after seeing the issue! Fortunately, the battery had a soft landing both times.
The laser, using the fully charged battery, draws about 520 mA (just over half an amp). Assuming the battery has 1800 mAh, as labeled, that would mean maximum continuous run time of under 3.5 hours. I'd be surprised to get all of that. Still, even a couple of hours is pretty good, considering the intermittent use a laser pointer of this type is likely to see.
The silver sticker says it is a Class III laser product, which complies with 21 cfr, wavelength 532 nm +/- 10. Maximum output power < 5,000 mW (< 5 Watts). I'd not put too much credence in what they print on the label, but there it is. Using the input current draw quoted above, and the battery at 4 volts, the input power is only 2 watts, and with the efficiency likely at most 50%, this suggests a nominal output of about a Watt (1,000 mW).
The laser body is sturdy aluminum, and all screw threads mesh as they should. It appears to be sturdy, though other reviewers have had variable luck with drops, etc. I did not open it up to check internal construction (don't mess with success, or attempt to fix what is not broken).
All-in-all a reasonable product for the price: a powerful-enough green laser, externally solid, well-collimated beam, usable 18650 battery and charger, with a flimsy, but serviceable storage case (don't rely on that external carrying cord, the plastic clasp is weak!). I don't see the point of the slightly cheaper green lasers with a built-in battery (usually a small battery, with short run-time), when this one accepts a standard-sized 18650 battery, which can be swapped out if the included one runs down in the field or quits holding a charge.
This is probably the pick of the litter of the green lasers on Amazon. Recommended.
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