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- New Battery Technologies - What Do We Need ? -
 Moderated by: W C Greene Page:  First Page Previous Page  ...  2  3  4  5  6  7   
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 Posted: Mon Mar 2nd, 2015 04:27 pm
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W C Greene
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Batteries...I will just stick with my ancient Li Pos since they are installed in my equally old locomotives. I have only had one problem with a Li Po and that was when I stuck one with a screwdriver. Man, I ripped that lokie open so quick and threw the battery into the back yard...I never have moved that fast! But it just puffed up and laid there! Wheew!
I agree with Pete, whatever works in flashlights, cellphones, and space shuttles may not be what we want or need. I listened to guys who have been flying r/c planes and racing r/c cars for many years and they guided me to what I have now. Since I am a dinosaur, I never searched the net or pondered the merits of converters, circuits, or found truth in internet mumbo jumbo. I know, I know...I am operating what is basically "On30 on steroids" and would rather have a bit of battery in the cab instead of intricate detail (but ALL my lokies have crews in the cabs) and be able to run my trains anytime, anywhere, on anybody's layout provided it is 16.5MM gauge.
Am I ranting? Hell yes...I am ranting about something that I feel strongly about-radio controlled model trains. Now I will slide back into my cave and do some switching at the smelter.

Please note that no batteries were abused during the above tirade...

Woodie



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 Posted: Mon Mar 2nd, 2015 07:32 pm
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NevadaBlue
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Good say Woodie! :bg:

So, is that cave of yours anything like the Caverns of Sonora?



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 Posted: Mon Mar 2nd, 2015 10:23 pm
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W C Greene
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Ken...LOL

Woodie



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 Posted: Mon Mar 2nd, 2015 10:42 pm
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Tramcar Trev
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LiPo's CAN be made to explode, youtube is full of videos attesting to this. In reality they usually just puff up and emit clouds of smoke and sometimes flames if they are deliberately abused. Unprovoked "explosions" are quite rare. Get things into proportion you are far more likely to be blown up by an exploding LPG cylinder than a LiPo battery venting its spleen...



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 Posted: Tue Mar 3rd, 2015 03:55 am
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dan3192
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Pete:

Re connecting NiMH cells together in a pack is challenging and NiMH cells with solder tabs is the preferred method of building packs, I disagree. I buy pre-wired battery holders and use ordinary batteries without tabs. No soldering is needed.

It's easy putting together NiMH cells. My Amtrak diesel uses 4 Eneloop AAA cells in a Radio Shack battery holder which gives me 4.8V and 800mAh. A second battery holder was placed behind the first and the wires were run to the front of the first battery holder and connected together, red to red, black to black. Done! I get 4.8V and 1600mAh. Perfect for what I'm doing.   

And re I don't recommend series parallel battery configurations - It makes everything much more complicated - It is not really needed for train guys, I also disagree. What I described above is a series parallel arrangement which I've used for several years with great success. I'm posting this photo again to show this. It's not complicated and the arrangement was ideal for getting the voltage and current capacity I wanted.   



I'm not going to address all the rhetoric you've thrown out as they skirt the real issues and are not constructive. I don't care about a battery's intended use. If it has the volts, amps and quality I want, and I don't abuse charge and discharge ratings, it will be of interest to me.

Dan    

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 Posted: Tue Mar 3rd, 2015 05:12 am
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Tramcar Trev
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dan3192 wrote:

A:  No.  The battery pack is intentionally built without a PCB.  Contrary to popular belief, a PCB does more harm than good to a battery pack.  A PCB prevents the battery pack to be balanced.  All lithium battery goes out of balance as the batteries age, there is no exception.
 
Not necessarily so. Some LiPo packs ( the dreaded) Blue ones have a small pcb on each cell which some how ensures that each cell is charged individually and also prevents voltage dropping too low ie under 3V.
These "batteries" are not equipped for balance charging and the suppliers claim the internal electronics takes care of it....
I have taken the outer packing off to gain some space and an electronics guru after he had looked at the chips on the boards and sussed out the circuit gave me the news that all protection boards are not the same, these aer the batteries to which I refer; http://www.ebay.com.au/itm/311164141028?_trksid=p2055119.m1438.l2649&ssPageName=STRK%3AMEBIDX%3AIT

they can be got in an assortment of A/H ratings that are not as generous as advertised....



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 Posted: Tue Mar 3rd, 2015 05:50 am
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Pete Steinmetz
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dan3192 wrote:
Pete:

Re connecting NiMH cells together in a pack is challenging and NiMH cells with solder tabs is the preferred method of building packs, I disagree. I buy pre-wired battery holders and use ordinary batteries without tabs. No soldering is needed.

It's easy putting together NiMH cells. My Amtrak diesel uses 4 Eneloop AAA cells in a Radio Shack battery holder which gives me 4.8V and 800mAh. A second battery holder was placed behind the first and the wires were run to the front of the first battery holder and connected together, red to red, black to black. Done! I get 4.8V and 1600mAh. Perfect for what I'm doing.   

And re I don't recommend series parallel battery configurations - It makes everything much more complicated - It is not really needed for train guys, I also disagree. What I described above is a series parallel arrangement which I've used for several years with great success. I'm posting this photo again to show this. It's not complicated and the arrangement was ideal for getting the voltage and current capacity I wanted.   



I'm not going to address all the rhetoric you've thrown out as they skirt the real issues and are not constructive. I don't care about a battery's intended use. If it has the volts, amps and quality I want, and I don't abuse charge and discharge ratings, it will be of interest to me.

Dan    


Dan:

What you are doing is quite different than what you referenced in your post. You can take the cells out to charge individually. You are not trying to charge them as a pack in series/parallel. The guy making bike packs was charging a pack. Big difference.

Ni-MH don't require PCMs. There are no balance issues because you are charging cells individually.

You have a good set up.

It would have made a lot more sense if you had showed this photo in an earlier post.

You have a lot of space, you are using Ni-MH and you are not using sound.

Most of us don't have the kind of space you do. Many of us are running sound. That's why we use lithium polymer. Better energy density than Ni-MH. We can buy cells and packs that have different lengths, widths, and heights.

Where is your receiver and decoder or speed control?



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