Battery Pack Assemblers, Panasonic Li-Ions?

[Ginseng]

Hi,

Has anyone here used any of the authorized Panasonic battery pack assemblers for building of Li-Ion packs with built-in safety circuits? I'm thinking this might be a more cost effective route than going with Pilas and more convenient that bare 17670 cells.

http://www.batteryspecialties.com/
http://www.rosebatteries.com/
http://www.nexergy.com/
http://www.avt.thomasregister.com/
http://www.nationalpower.com/
http://www.protechnologies.com/
http://www.eacnet.com/
http://www.micro-power.com/
http://www.fedcoelectronics.com/

I would want a parallel-serial stack of 2x3x17670 for use with 9.6V bulbs or 2x2x17670 for 7.2V bulbs. Overdischarge and overcharge circuitry would be great. Regulation circuitry would also be a great advantage.

Wilkey

 

[Kevin Tan]

I know that www.sabahoceanic.com will do what you want for free. Remember you need to have at least a charge limitting circuit and optionally a low voltage cutoff. But i have to ask about charging the batts, how and what would you use to do it? Strip a laptop and go throught the motherboard to look for the charging circuit? Most of the laptops that I know off use different voltage to what you are looking for. But dont let me discourage you. Keep on digging, and you will get it .

 

[Christoph]

I am in the process of developing a li-ion pack and charge/controller circuit to fit 2 D type modded lights the voltages will go 3.7 or 7.2 mah will be 3450mah and 2300mah
charger will be a 12vdc wallwart with w/p jack to mount in tailcap. I am putting one in with my MR circuit in a 2D mag
so far run times look good with the 2300mah pack.Now just to work out the packaging and thermal probe placement.
Chris /ubbthreads/images/graemlins/grin.gif

 

[Ginseng]

Thanks Kevin,
Those were exactly the two circuits I thought would be critical. These are the ones inside the Pila batts IIRC. Once a pack is fitted with those two, I imagine a universal smart charger could do the trick.

Christoph,
That sounds fantastic. Also, unfortunately well out of my competency. May I ask for some more details? Such as cells, circuitry, etc.

Wilkey

 

[Christoph]

Ginseng
The cells at this point are 3.7 Volt, 1400 mAh rechargeable lithium-ion cells made by Panasonic the cells I want to use are a little lower capacity but I can use more cells to regain that. The controllers are off the shelf components that I am putting to use in user friendly packages.These hopefully might appeal to MR-X users.
Chris /ubbthreads/images/graemlins/wink.gif

 

[Ginseng]

Hmm,

I can't seem to find a Panasonic cell with 1400mAh cap. The 17500 has 830mAh and the 18650 has either 1800 or 2000 mAh. I think Sanyo has a LiIon in this size with about 1400mAh.

I know it's premature, but if you are planning on making some of those modules up for sale, I would be pleased to take one or two.

Wilkey

 

[LitFuse]

I don't know about 1400mAh Li-ions, but the Panasonic 17670's are rated at 1500mAh. One of these is the same size as 2 x 123s.

http://www.sabahoceanic.com/lithium.html


Peter

 

[Ginseng]

Thanks Lit,

For some reason that battery is missing from the Panasonic OEM Battery web page. Panasonic OEM LiIon Batts

Wilkey

 

[Mark_Paulus]

Anyone have any ideas about a 18650 to 2 'D' cell converter? I have a Blaster VI that works well with 2 18650s. Right now I am charging the cells individually with a Maha C777plus-II, and that seems to work ok. And I have created a "roll your own" 18650 to D converter using some PVC and foam rubber. But, I would like something a bit more permanent and sturdy. If anyone has any ideas, I would be appreciative.