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Old 12-31-2011, 07:57 PM #1
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Default 1000mw 3.2v cr123a Battery issues

I bought a laser from ox lasers, (it's my first) and I have charged the Li Ion Battery and the beam hold strength diminishes after a good 3 to 5 minutes. The operations sheet says the battery should last about 2 hours at full charge, but it's just fading.


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Old 12-31-2011, 08:17 PM #2
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Default Re: 1000mw 3.2v cr123a Battery issues

Is the laser getting really hot? What is the batery voltage after such a long duty cycle when it dims? Which exact laser do you have?
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Old 12-31-2011, 08:18 PM #3
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Default Re: 1000mw 3.2v cr123a Battery issues

Wholesale Product Snapshot Product name is oxlasers newest OX-BX1 waterproof 1000mW / 1W focusable burning Blue laser pointer + free laser glasses +free shipping I have this one.
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Old 12-31-2011, 08:19 PM #4
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Default Re: 1000mw 3.2v cr123a Battery issues

it doesn't get very hot, it get warm in the hand but I thinks it's my body heat heating the casing.
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Old 12-31-2011, 09:11 PM #5
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Default Re: 1000mw 3.2v cr123a Battery issues

That host potentially can support long duty cycles, it looks substantial. I would still stick to 2 minutes and less. A true 880ma 16340 battery will give about an hour at 1W. If the battery is dead, from a full charge, after running ~1amp for 3 minutes, then you have a bad battery. If the laser works fine again after it rests for a while/ cools down, shorten your duty cycle (on time) as something is probably heating up,the driver possibly.
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Old 12-31-2011, 09:23 PM #6
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Default Re: 1000mw 3.2v cr123a Battery issues

thanks ill buy a new battery soon and cut back on operating time.
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Old 12-31-2011, 09:32 PM #7
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Default Re: 1000mw 3.2v cr123a Battery issues

Quote:
Originally Posted by Drew View Post
That host potentially can support long duty cycles, it looks substatial. I would still stick to 2 minutes and less. A true 880ma 16340 battery will give about an hour at 1W. If the battery is dead, from a full charge, after running ~1amp for 3 minutes, then you have a bad battery. If the laser works fine again after it rests for a while/ cools down, shorten your duty cycle (on time) as something is probably heating up,the driver possibly.
No way - not a chance. For one, there's no hope in hell that they gave him a true 880mA 16340 battery as the freebie with his laser purchase. Plus, 880mAh wouldn't come anywhere close to an hour of 1W runtime. For one, these Chinese builds aren't running the latest M140 higher efficiency diodes. Two, their lenses aren't anywhere near as decent as a G1 or often even a 3-element Aixiz. Three, they're using a boost driver, which not only means a higher current drain on the cell, but also implies efficiency losses. To get 1W, you're probably looking at more like 20 minutes from the CR123 cell. Now, granted, the one thing that works in hist favor, is that this probably isn't a true 1W laser either

But, there's no real mystery here. The operation sheet was written by liars.

1) Your CR123 is probably 600mAh in actual capacity.
2) Your laser's diode needs ~5V, and maybe ~1.2A to deliver ~1W of output.
3) Your battery supplies a nominal ~3.7V
4) The boost driver in that host is maybe 80% efficient
5) That implies a current draw from the cell of ((5 / 3.7) / 0.8) * 1.2 = ~2,025mA
6) At 2,025mA of currect draw, your 600mAh cell should be depleted in ((600 / 2025) * 60) = 17.7 minutes

In other words, they were stupid for suggesting that you'd see 2 hours of run-time. 17 minutes is more likely. If you're seeing it dim after 3 or 4 minutes, then it's probably a combination of crappy diode heatsinking, crappy boost driver heatsinking, and a crappy cell.
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SAFETY & IMPORTANT READING (threads authored and contributed to by various members of LPF):
- Federal Aviation Administration - Laser Safety Initiative (link)
- Info release from Laserglow - Default Canadian restrictions on portable lasers (link)
- The Necessity of Safety Goggles (link)


Last edited by rhd; 12-31-2011 at 09:37 PM.
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