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Old 01-26-2017, 12:03 AM #17
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Default Re: A thread about voltage

Quote:
Originally Posted by Accutronitis View Post
a battery which is rated at Ni-Cd 3.6V 1.8Ah...
If it's older than a few months, it will be quite a bit lower than 1.8Ah. Any NiCd cell older than a few years will have capacity of near zero. NiCd is in no way superior to modern battery technologies. Nobody uses them any more because they're garbage.


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Old 01-26-2017, 12:47 AM #18
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Default Re: A thread about voltage

Heck I can replace the Ni-Cd with 2 18650 3.7V 9900mAh Li-ion for cheap ! That should be able to power a monster laser shouldn't it ?

That would be 7.4V 9900mAh power to run the laser, is there anything better than that in a comparable size setup ?
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Old 01-26-2017, 12:53 AM #19
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Default Re: A thread about voltage

Quote:
Originally Posted by Rivem View Post

This kills me as an engineer. Especially as an EE.
Please read this: How to convert milliamps to amps (A)

Edit: Your edit makes no sense. You divide your 2800mAh by 1000 to get 2.8 Ah. Charge is inconsequential.
Sorry I had already changed that before you could post....
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Old 01-26-2017, 12:54 AM #20
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Default Re: A thread about voltage

Quote:
Originally Posted by Accutronitis View Post
Heck I can replace the Ni-Cd with 2 18650 3.7V 9900mAh Li-ion for cheap ! That should be able to power a monster laser shouldn't it ?
There aren't any 9000mah 18650's. 3500mah max. LG Sanyo and Panasonic. There are only a few actual manufactures of these batteries. Outside of them are just rewraps that use one reason or another to make a claim.
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Old 01-26-2017, 12:57 AM #21
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Default Re: A thread about voltage

So this is just BS sales ?

Top Quality 4pcs 18650 3.7V 9900mAh Li-ion Rechargeable Battery and 2 X Charger | eBay

So my 2 2800mAh batteries are more than likely 700mAh batteries ?
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"Thor's Hammer" Americanised TLY-L201 Host Build W/Old School NASA Type Safety Switch - DTR NUBM44 6.8 Watts at 4.5 Amps 450nm Diode In 25mm Copper Module W/Driver - DTR G-2 lens - OPT Laser 6X Cylindrical Lens Pair Fast Axis Correction w/ Custom Made Beam Expander Class IV

303 Prome Star Series Green Laser 532nm 80mW DPSS Class IIIb

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Old 01-26-2017, 01:06 AM #22
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Default Re: A thread about voltage

The space I have for batteries is appox 127mm X 23mm do any killer batteries that could fit that space come to mind with anybody ?
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"Thor's Hammer" Americanised TLY-L201 Host Build W/Old School NASA Type Safety Switch - DTR NUBM44 6.8 Watts at 4.5 Amps 450nm Diode In 25mm Copper Module W/Driver - DTR G-2 lens - OPT Laser 6X Cylindrical Lens Pair Fast Axis Correction w/ Custom Made Beam Expander Class IV

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Old 01-26-2017, 01:26 AM #23
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Default Re: A thread about voltage

Quote:
Originally Posted by Accutronitis View Post
I can believe that The very light Li-Ion batteries (2 cells) on the right have more capacity than the Ni-Cd battery (3 cells) on the left ? Is that correct ?!?



How can that be ?

If there is no mistake and the 2 batteries on the right are that much better than the 3 on the left i'll find Li-Ion cells that will fit in the same space as the Ni-Cd's did !
Actually, Each of the lithium cells pictured should have about the same storage capacity as all 3 of the NiMH cells combined. A lithium ion cell puts out 3 times the voltage as a NiMH cell.
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Old 01-26-2017, 01:30 AM #24
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Default Re: A thread about voltage

Hey I can fit 2 ea 26650 Li-Ion batteries in place of the Ni-Cd, Anything I should know about buying no BS 26650 Li-Ion batteries
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My very short laser collection (for now)

Thor "Saber" Americanised Thor M II - DTR M462 2.2 Watt 462mn Diode W/Super X-Drive @ 1.8 Amps - DTR G-2 lens - JL 10X Beam Expander Class IV

"Thor's Hammer" Americanised TLY-L201 Host Build W/Old School NASA Type Safety Switch - DTR NUBM44 6.8 Watts at 4.5 Amps 450nm Diode In 25mm Copper Module W/Driver - DTR G-2 lens - OPT Laser 6X Cylindrical Lens Pair Fast Axis Correction w/ Custom Made Beam Expander Class IV

303 Prome Star Series Green Laser 532nm 80mW DPSS Class IIIb
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Old 01-26-2017, 01:32 AM #25
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Default Re: A thread about voltage

Quote:
Originally Posted by WizardG View Post
Actually, Each of the lithium cells pictured should have about the same storage capacity as all 3 of the NiMH cells combined. A lithium ion cell puts out 3 times the voltage as a NiMH cell.
And at a fraction of the weight !

I hadn't realized battery tech had progressed as much as it has !
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My very short laser collection (for now)

Thor "Saber" Americanised Thor M II - DTR M462 2.2 Watt 462mn Diode W/Super X-Drive @ 1.8 Amps - DTR G-2 lens - JL 10X Beam Expander Class IV

"Thor's Hammer" Americanised TLY-L201 Host Build W/Old School NASA Type Safety Switch - DTR NUBM44 6.8 Watts at 4.5 Amps 450nm Diode In 25mm Copper Module W/Driver - DTR G-2 lens - OPT Laser 6X Cylindrical Lens Pair Fast Axis Correction w/ Custom Made Beam Expander Class IV

303 Prome Star Series Green Laser 532nm 80mW DPSS Class IIIb

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Old 01-26-2017, 10:58 PM #26
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Default Re: A thread about voltage

Think of voltage like a water pipe. The speed of the water through the pipe represents the current or Amperage. The amount of water flowing through the pipe represents the voltage.
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Old 01-26-2017, 11:04 PM #27
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Default Re: A thread about voltage

Well I do know this I know this, The way in which the laser power output drops does not suggest a battery issue IMHO....
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My very short laser collection (for now)

Thor "Saber" Americanised Thor M II - DTR M462 2.2 Watt 462mn Diode W/Super X-Drive @ 1.8 Amps - DTR G-2 lens - JL 10X Beam Expander Class IV

"Thor's Hammer" Americanised TLY-L201 Host Build W/Old School NASA Type Safety Switch - DTR NUBM44 6.8 Watts at 4.5 Amps 450nm Diode In 25mm Copper Module W/Driver - DTR G-2 lens - OPT Laser 6X Cylindrical Lens Pair Fast Axis Correction w/ Custom Made Beam Expander Class IV

303 Prome Star Series Green Laser 532nm 80mW DPSS Class IIIb
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Old 01-26-2017, 11:11 PM #28
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Default Re: A thread about voltage

Quote:
Originally Posted by HydroSean View Post
Think of voltage like a water pipe. The speed of the water through the pipe represents the current or Amperage. The amount of water flowing through the pipe represents the voltage.

Your first part is correct, the second part isn't. Voltage is more akin to water pressure in your analogy.
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Old 01-27-2017, 03:21 AM #29
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Default Re: A thread about voltage

Quote:
Originally Posted by diachi View Post
Your first part is correct, the second part isn't. Voltage is more akin to water pressure in your analogy.
I like the plumbing analogy. The diode is a backflow check valve and the voltage is the pressure required to open the check valve and amperage is the measure of volume that passes through the valve. Am I right?
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Old 01-27-2017, 03:27 AM #30
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Default Re: A thread about voltage

The water pipe analogy has always been one of the best ever !
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Old 01-27-2017, 03:28 AM #31
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Default Re: A thread about voltage

Does the analogy work for pentodes, magnetrons, vacuum fluorescent displays, numitrons, pressure transducers, and negative temperature coefficient thermistors?
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Old 01-27-2017, 03:31 AM #32
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Default Re: A thread about voltage

Quote:
Originally Posted by Cyparagon View Post
Does the analogy work for pentodes, magnetrons, vacuum fluorescent displays, numitrons, pressure transducers, and negative temperature coefficient thermistors?
It works for all kinds of big words like that
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