Laser pointer discussion. Read/write reviews of laser pointers and laser pointer companies. Learn about all types of laser pointers and lasers





Welcome to Laser Pointer Forums! If you are looking for a laser pointer or want to compare different laser pointer companies, you may want to check out the LPF Laser Pointer Company Database. The link will open in a new window for your convenience.








Green Laser Pointers by Category Blue Laser Pointers by Category Red Laser Pointers by Category
Yellow Laser Pointers by Category Violet Laser Pointers by Category Orange Laser Pointers by Category
Top Laser Pointers by Power - 1 Watt+ Top Laser Pointers by Power - 500mW+ Top Laser Pointers by Power - 250mW+
Laser Pointer Database High Power Laser Pointers Laser Pointer Diodes
Laser Technology Laser Pointer Parts Lasers by Wavelength
Top 10 Laser Pointer Companies Laser Pointer Company Database Visible Beam Laser Pointers


One laser store meets all your needs

























Go Back   Laser Pointer Forums - Discuss Laser Pointers > Lasers > Tutorials, Help & Repairs



LPF List of Laser Pointer Companies (link opens new window)



Reply
 
LinkBack Thread Tools Display Modes
Old 07-06-2010, 10:31 AM #1
Junior Member
 
Join Date: Jul 2010
Location: Down Under
Posts: 22
Rep Power: 0
Brendan is on a distinguished road
Brendan Brendan is offline
Junior Member
 
Join Date: Jul 2010
Location: Down Under
Posts: 22
Rep Power: 0
Brendan is on a distinguished road
Default 18650 vs 3x Ni-Mh (AA - D) Batteries. Whats the Difference?

Hello all,

I'm new to LPF and currently planing/starting my first DIY Green Module build. Just have a quick question in regards with the supply(cell) power source. I'm planning on using module 150mw 532nm 3.5v - 4.2v.
I have searched but couldn't find a direct comparison between the 2.

What is the difference between 18650 vs 3x NiMH batteries.

I know that;

18650 is
Lithium-ion
3.7volt Nom
4.2volt Max
2500~mAh

3x NiMH is (AA, C, D)
nickel-metal hydride
3x 1.2v = 3.6v (Is this Nom or Max?)
2000-10,000 mAh depending on cell size and quality

So which battery setup is best? and why?

Thanks


Brendan is offline   Reply With Quote







LPF List of Laser Pointer Companies (link opens new window)







Old 07-06-2010, 03:50 PM #2
Bionic-Badger's Avatar
Class 4 Laser
 
Join Date: Oct 2007
Location: Oregon, USA
Posts: 5,476
Rep Power: 1792
Bionic-Badger has a reputation beyond reputeBionic-Badger has a reputation beyond reputeBionic-Badger has a reputation beyond reputeBionic-Badger has a reputation beyond reputeBionic-Badger has a reputation beyond reputeBionic-Badger has a reputation beyond reputeBionic-Badger has a reputation beyond reputeBionic-Badger has a reputation beyond reputeBionic-Badger has a reputation beyond reputeBionic-Badger has a reputation beyond reputeBionic-Badger has a reputation beyond repute
Bionic-Badger Bionic-Badger is offline
Class 4 Laser
Bionic-Badger's Avatar
 
Join Date: Oct 2007
Location: Oregon, USA
Posts: 5,476
Rep Power: 1792
Bionic-Badger has a reputation beyond reputeBionic-Badger has a reputation beyond reputeBionic-Badger has a reputation beyond reputeBionic-Badger has a reputation beyond reputeBionic-Badger has a reputation beyond reputeBionic-Badger has a reputation beyond reputeBionic-Badger has a reputation beyond reputeBionic-Badger has a reputation beyond reputeBionic-Badger has a reputation beyond reputeBionic-Badger has a reputation beyond reputeBionic-Badger has a reputation beyond repute
Default Re: 18650 vs 3x Ni-Mh (AA - D) Batteries. Whats the Difference?

As far as powering your circuit, it really doesn't matter what you use so long as the batteries can provide enough voltage and current for your needs. The LiIon/LiPol batteries are lighter and smaller than NiMH batteries, and the higher voltage they provide means you can use fewer of them in tighter locations. Size and voltage are really the main reason people prefer them. Current-driving ability is also a reason to choose LiIon/LiPol batteries over alkalines, but I think NiMH batteries are able to source current quite well.
Bionic-Badger is offline   Reply With Quote
Old 07-06-2010, 04:36 PM #3
Junior Member
 
Join Date: Jul 2010
Location: Down Under
Posts: 22
Rep Power: 0
Brendan is on a distinguished road
Brendan Brendan is offline
Junior Member
 
Join Date: Jul 2010
Location: Down Under
Posts: 22
Rep Power: 0
Brendan is on a distinguished road
Default Re: 18650 vs 3x Ni-Mh (AA - D) Batteries. Whats the Difference?

I found out by searching NiMH discharge graphs that a full charge of a NiMH cell will be close to 1.4v but only for a VERY short time before dropping off and sitting at around 1.25v (Depending on current draw).
So 3x 1.25v = 3.75v. Pretty much the same/similiar to a 18650.

Quote:
Originally Posted by Bionic-Badger View Post
Size and voltage are really the main reason people prefer them.
Between the 2 options they both have similiar voltage, and can handle high current discharges. So i would think that it may just be a matter of Size vs mAh.
Do you want a smaller host/recharge more frequently or do you want a big host/longer lasting cells between recharges.

Unless anybody could add other factors that would make 1 option better than the other??
Brendan is offline   Reply With Quote
Old 07-07-2010, 04:39 AM #4
Bionic-Badger's Avatar
Class 4 Laser
 
Join Date: Oct 2007
Location: Oregon, USA
Posts: 5,476
Rep Power: 1792
Bionic-Badger has a reputation beyond reputeBionic-Badger has a reputation beyond reputeBionic-Badger has a reputation beyond reputeBionic-Badger has a reputation beyond reputeBionic-Badger has a reputation beyond reputeBionic-Badger has a reputation beyond reputeBionic-Badger has a reputation beyond reputeBionic-Badger has a reputation beyond reputeBionic-Badger has a reputation beyond reputeBionic-Badger has a reputation beyond reputeBionic-Badger has a reputation beyond repute
Bionic-Badger Bionic-Badger is offline
Class 4 Laser
Bionic-Badger's Avatar
 
Join Date: Oct 2007
Location: Oregon, USA
Posts: 5,476
Rep Power: 1792
Bionic-Badger has a reputation beyond reputeBionic-Badger has a reputation beyond reputeBionic-Badger has a reputation beyond reputeBionic-Badger has a reputation beyond reputeBionic-Badger has a reputation beyond reputeBionic-Badger has a reputation beyond reputeBionic-Badger has a reputation beyond reputeBionic-Badger has a reputation beyond reputeBionic-Badger has a reputation beyond reputeBionic-Badger has a reputation beyond reputeBionic-Badger has a reputation beyond repute
Default Re: 18650 vs 3x Ni-Mh (AA - D) Batteries. Whats the Difference?

Well the NiMH batters may not last as long as LiPo batteries either. LiPo batteries have the highest charge per unit weight for rechargeables, so a single 18650 will usually have more mAh than three NiMH batteries, despite roughly the same voltage. NiMH batteries should also last longer than LiPo batteries, because LiPos don't like being charged/discharged as much. LiPos self-discharge slower than NiMH batteries though.

For your lasers, I'd just stick with the LiPo batteries as much as possible because you only need few of them, and they don't weight that much. For NiMH you need multiple batteries to get the right voltage, and even with AAA batteries that can get bulky. Imagine the difference using a LM317 for powering a Bluray: six AAA batteries versus two LiPos. 18650s aren't exactly tiny, but two would fit into a host much nicer.
Bionic-Badger is offline   Reply With Quote
Old 07-07-2010, 06:58 AM #5
Junior Member
 
Join Date: Jul 2010
Location: Down Under
Posts: 22
Rep Power: 0
Brendan is on a distinguished road
Brendan Brendan is offline
Junior Member
 
Join Date: Jul 2010
Location: Down Under
Posts: 22
Rep Power: 0
Brendan is on a distinguished road
Default Re: 18650 vs 3x Ni-Mh (AA - D) Batteries. Whats the Difference?

Arn't 18650 a li-ion, not a li-po?

Quote:
Originally Posted by Bionic-Badger View Post
so a single 18650 will usually have more mAh than three NiMH batteries, despite roughly the same voltage..
In my case, my options are 1x 18650 or 3x "C size" NiMH's.
18650 - 2500mAh~ 3.7v
3x C NiMH - 8000mAh~ 3.6v-3.7v

I realise that the size of the host will be much larger to accompany these batteries but this OK. I just want the best performing battery setup.

This measures 230mmx38mm (9in x 1.4in)
eg.
Brendan is offline   Reply With Quote
Reply





Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On


LinkBacks (?)
LinkBack to this Thread: http://laserpointerforums.com/f51/18650-vs-3x-ni-mh-aa-d-batteries-whats-difference-52605.html
Posted By For Type Date
What Is The Difference In The Green And Purple Format? | Ask Help Box This thread Refback 07-07-2014 07:07 PM
What is 18650 VS AA? This thread Refback 10-12-2013 12:17 PM
UF-2100 1000LM 5-Mode CREE XM-L T6 Super Bright LED Flashlight $11.5 Include Shipping - OzBargain This thread Refback 01-29-2013 01:22 AM
What is 18650 VS AA? This thread Refback 12-07-2012 06:35 PM










Loading








Green Laser Pointers by Category Blue Laser Pointers by Category Red Laser Pointers by Category
Yellow Laser Pointers by Category Violet Laser Pointers by Category Orange Laser Pointers by Category
Top Laser Pointers by Power - 1 Watt+ Top Laser Pointers by Power - 500mW+ Top Laser Pointers by Power - 250mW+
Laser Pointer Database High Power Laser Pointers Laser Pointer Diodes






Privacy Policy | Advertising Disclaimer | Terms of Use


 


All times are GMT. The time now is 08:04 AM.


Powered by: vBulletin
Copyright ©2000 - 2017, Jelsoft Enterprises Ltd.
Search Engine Friendly URLs by vBSEO
Privacy Policy | Advertising Disclaimer | Terms of Use
Copyright (C) 2017 Laser Pointer Forums, LLC