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- New Battery Technologies - What Do We Need ? -
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 Posted: Thu Jan 29th, 2015 10:18 pm
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Rod Hutchinson
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I use Skyrc unit. Cheap, cheerful & works.

Have a look at eBay item 371163853162



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 Posted: Thu Jan 29th, 2015 10:22 pm
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Tony Walsham
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Nice find Trev but that does not have a JST cable connector.
Perhaps Ken could be more explicit as to which type of JST connector he had in mind.



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 Posted: Thu Jan 29th, 2015 10:32 pm
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NevadaBlue
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I guess you guys are right. I'll add the three necessary wires to my Y-connector on the battery pack and order the charger and some plug/socket combos. I don't have any of the 3 prong balance plugs at all.

This is what I wanted to use, but probably best to do it right.




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 Posted: Fri Jan 30th, 2015 01:34 am
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dan3192
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Pete,

I hope you noticed the batteries and voltage regulator are mounted in an 80' combine car, or cheat car as some naysayers call it. See Post #687 under the DelTang topic for a photo of the arrangement used. Post #702 gives information on performance and expected run times based on the original cells. These higher capacity cells (50% more capacity!) are what I used at the Amherst show.

My main problems with Lipos are the oversized wiring and big connectors used to handle high currents. I have several square shaped Turnigy Nano-Tech 2s and 3S Lipos I have difficulty fitting in a model. I'm also not wanting to modify the wiring to fit the small Pololu connectors I use. They might be better suited for larger scales.  We'll see.

Early on I bought a few AA and AAA China-made Li-ion cells and quickly found out how grossly overrated they are. They look nice, but don't live up to their specs. I started using Eneloop NiMH batteries and they are great. What they lack in capacity they make up for in weight, about 30% heavier than Lithium cells, which is good for traction. My Amtrak diesel weighs in at 1 lb, 2 oz and outpulls my Hudson steamer!

Dan

 

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 Posted: Fri Jan 30th, 2015 03:36 am
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NevadaBlue
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Thanks for the advice. I ordered a simple 2s/3s charger and a bunch of the proper connectors this afternoon.



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 Posted: Fri Jan 30th, 2015 03:40 am
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Tramcar Trev
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Yes the leads are designed for massive currents. Solution is simple though but does require a little care. VERY CAREFULLY remove the outer wrapping around the battery at the point where the leads come out. Its usually heat shrink or fibreglass tape. Then expose the points where the leads are soldered onto what is the under volatge/over current protection PCB and then put something over one of them to insulate it to prevent accidents. Then unsolder the wire and solder your own thinner more flexible wire on, then repeat for the other wire. Recover with some form of insulation, I use the liquid tape stuff. If space permits this can be done with far less adventure by cutting the existing wires off (ONE AT A TIME) and soldering on your own wire and cover with heatshrink. This lets you choose the connector of choice. I use the red JST ones they can handle around 5Amps...



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 Posted: Fri Jan 30th, 2015 03:47 am
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Tramcar Trev
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dan3192 wrote:
Early on I bought a few AA and AAA China-made Li-ion cells and quickly found out how grossly overrated they are. They look nice, but don't live up to their specs. I started using Eneloop NiMH batteries and they are great. What they lack in capacity they make up for in weight, about 30% heavier than Lithium cells, which is good for traction. My Amtrak diesel weighs in at 1 lb, 2 oz and outpulls my Hudson steamer!

Dan

 

I have a source of 18650 cells for free. I buy them as per the capacity in the ebay add knowing no way can you get 5a/h into a 18650 case, send the seller a question asking if the capacity is genuine, they assure me it is so I buy a dozen. The Cells arrive, I check the capacity on my ImaxB6AC smart charger and discover they are in reality 2.2a/h complain to the seller, demand a refund, they refund and I have a dozen 18650 Lion cells for free. You may call me a a devious underhand cold callous turd but hey I asked the questions before purchase.



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 Posted: Fri Jan 30th, 2015 03:36 pm
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Pete Steinmetz
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"I have a source of 18650 cells for free. I buy them as per the capacity in the ebay add knowing no way can you get 5a/h into a 18650 case, send the seller a question asking if the capacity is genuine, they assure me it is so I buy a dozen. The Cells arrive, I check the capacity on my ImaxB6AC smart charger and discover they are in reality 2.2a/h complain to the seller, demand a refund, they refund and I have a dozen 18650 Lion cells for free. You may call me a a devious underhand cold callous turd but hey I asked the questions before purchase."

I would be very careful with those cells. There are lots rejects floating around China. Somebody buys them.

I had a colleague offer me 10,000 18650 cells made by Samsung for $1.00 each. When I asked what was the reason for selling cells so cheap, I was told they were recalled and that 1 in every 1000 "Could" explode or at least suffer thermal runaway due to a flaw in the manufacturing process. There was no way to test them and figure out bad cells. Needless to say, I declined the offer.
Somebody bought those cells and either resold them in bulk or used them to power something. Kind of makes you think!!!



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 Posted: Sat Jan 31st, 2015 09:44 pm
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Tramcar Trev
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I suspect all the batteries that come out of china are made at "China Battery Factory 21". Most are fake branded and thats all you would expect. The ones I gouged seem to be ok apart from their claimed capacity, they all have undervoltage/short circuit protection boards under the shrinkwrap at the -end... The factor that interests me is that they can be sent airmail to AU.... I thought that was against international air freight regs too....

The other batteries popular for model railway use in larger scale are the so called "Blue" batteries, see; http://www.ebay.com.au/itm/311164141028?_trksid=p2055119.m1438.l2649&ssPageName=STRK%3AMEBIDX%3AIT

These I have found to be close to the stated capacity and can be made much smaller by removing the blue packaging and replacing it with either a dunk in Liquid tape or covering in self amalgamating tape.



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There once was a man who said Damn!!
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A creature that moves
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I'm not a Bus, I'm a tram
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 Posted: Sun Feb 1st, 2015 02:40 am
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bobquincy
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I go with what Dan does and mostly use NiMH cells.  They are consistent, meet the published specs, are easy to find if I need some in a pinch, and are fairly tolerant of charging/discharging.  Of course I use LiPo for my N scale models since nothing else will fit and provide decent run time.
The low self discharge NiMH cells have slightly less capacity than the standard types, the choice depends on if you will use them soon after charging or not.

My latest project originally used 2xAA so I stuck with those and boosted the voltage to 3.7 V with a step up regulator from Pololu.

boB

Last edited on Sun Feb 1st, 2015 02:42 am by bobquincy



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