Freerails Home 
Home Search search Menu menu Not logged in - Login | Register
Freerails > Model Railroad Forums > R.C. Control - The Future Now If You Desire > Dr. StrangeLiPo ... or How I Learned To Stop Worrying & Love The Battery !

Because of non-railroad abuse of the site, new members MUST use their first names (at least) to join NO EXCEPTIONS!

Dr. StrangeLiPo ... or How I Learned To Stop Worrying & Love The Battery !
 Moderated by: W C Greene Page:    1  2  3  4  5  6  ...  Next Page Last Page  
New Topic Reply Printer Friendly
 Rate Topic 
AuthorPost
 Posted: Fri Apr 21st, 2017 12:57 pm
  PMQuoteReply
1st Post
Si.
Super Moderator


Joined: Thu Feb 23rd, 2012
Location: London
Posts: 3217
Status: 
Offline
There's this Texan guy Woodie  :cb:  who you might know.

He's been trying to warp my copper-wired D.C. brain for some years now !



His mantra has been spinning around in my head, like rotors on a quadcopter !! :Crazy:

R.C. ... R.C. ... R.C. ... R.C. ...



The $1000 dollar loco I wanted was out of the question, after the rent cheque went out ! :f:

So I had to settle for a $20 buck Model-Power Plymouth instead !!



I stuck my neck out the other day, and said I thought it could be R.C.ed for £15 quid.

Is it possible to put together a HIGH QUALITY system, for the same price as 3-pints of beer ? L:



Could be . . .



Here's the story . . .



:brill:



Si.




____________________

' Mysterious Moose Mountain ' - 1:35n2 - pt.II
http://www.freerails.com/view_topic.php?id=7318&forum_id=17&page=1

' M:R:W Motor Speedway !!! ' - 1:32 Slotcar Racing Layout
http://www.slotforum.com/forums/index.php?showtopic=59295&st=0&a
Back To Top

 Posted: Fri Apr 21st, 2017 02:37 pm
  PMQuoteReply
2nd Post
Si.
Super Moderator


Joined: Thu Feb 23rd, 2012
Location: London
Posts: 3217
Status: 
Offline



____________________

' Mysterious Moose Mountain ' - 1:35n2 - pt.II
http://www.freerails.com/view_topic.php?id=7318&forum_id=17&page=1

' M:R:W Motor Speedway !!! ' - 1:32 Slotcar Racing Layout
http://www.slotforum.com/forums/index.php?showtopic=59295&st=0&a
Back To Top

 Posted: Fri Apr 21st, 2017 03:58 pm
  PMQuoteReply
3rd Post
W C Greene
Super Moderator


Joined: Fri May 4th, 2007
Location: Dallas, Texas USA
Posts: 7323
Status: 
Offline
I keep telling you, I DIDN'T spend mega bucks for either locos or r/c equipment. The stuff I bought has been working now for ALMOST 20 years! Yes, the boards are that old and the Li Po batteries are just about that old. The problems with these batteries going nuclear is because car racers and copter/aircraft modelers may have several models but normally have ONE SET OF BATTERIES and when they start running out of punch, they want to recharge IN A HURRY and that's when the batteries smoke! My old batteries get what amounts to a trickle charge. I have more than one lokie so if the road loco needs water & coal, I have another one all topped up to use. Besides, when I need a charge, I am usually tired of switching for several hours and need a charge myself.

Woodie



____________________
Go ahead, make my day!
Back To Top

 Posted: Fri Apr 21st, 2017 05:08 pm
  PMQuoteReply
4th Post
Bob R
Registered


Joined: Thu Nov 20th, 2014
Location: Papillion, Nebraska USA
Posts: 257
Status: 
Offline
Ditto what Woodrow says.  Low cost engines and RC gear always puts a smile on my face.The battery issue is always debated.  
On the DeadRail site there is a current argument going on about use of RC batteries versus "high quality" lipos.   Woodie is correct about our use with low current rate charging etc. 
I also race RC cars and fly RC planes.  Car racers, in order to get the max performance, charge at very high amp rates (frequently in excess of 20 amps). The newer race chargers have the ability to over charge - ie charge to more than 4.2 volts per cell.  They do not care about battery safety or battery life.  Only going fast.
I have never had a battery failure with a small RC train lipo and I buy the cheaper RC cells. Use a decent charger and reasonable precautions and you will wonder what the debates are all about.
Bob



____________________
Bob
Back To Top

 Posted: Fri Apr 21st, 2017 06:12 pm
  PMQuoteReply
5th Post
Bob D
Registered
 

Joined: Wed Apr 1st, 2015
Location: Portsmouth, USA
Posts: 550
Status: 
Offline
What scale are we talking here? What voltage motors?

I'm in O-scale and the motors are typically 12-15 vdc can types. I generally use 9.6 NiMh or 11.1 LiPo packs in my tenders. The couple of engines I have that use 15vdc motors run fine at slow speed, but they're not very fast at the top end. I think I timed my 14lb. Williams brass 4-8-4 N&W Class J at just under 50mph wide open, my Lionel die cast 4-8-2 is about the same.

I could probably get away with 1000Mah packs as the 2000 and 2200 run for 2.5 hours or so and take about the same time to recharge. A 1000Mah pack would most likely run 1+ hours and take the same to recharge. Hey, just bring it in for "re-fueling" and put another engine to work!!!



____________________
BobD
O-SCALE BPRC
Back To Top

 Posted: Fri Apr 21st, 2017 06:54 pm
  PMQuoteReply
6th Post
W C Greene
Super Moderator


Joined: Fri May 4th, 2007
Location: Dallas, Texas USA
Posts: 7323
Status: 
Offline
I don't have the experience with large O scale or larger scale locos so I can't give any useful info. My locos are Bachmann On30 jobs with some added "parts". The Shays run with 1100 (?) MAH 2 cells, the little Porters have 800 (?) MAH 2 cells. I believe the lone tender loco, a 4-4-0 has an 1100 (?) in it also. I don't fancy taking the locos apart to look at the exact sizes, they have been installed a long time and I have painted them flat black anyway!
Oh hell, I do things wrong anyway!

Woodie



____________________
Go ahead, make my day!
Back To Top

 Posted: Fri Apr 21st, 2017 07:26 pm
  PMQuoteReply
7th Post
Bob R
Registered


Joined: Thu Nov 20th, 2014
Location: Papillion, Nebraska USA
Posts: 257
Status: 
Offline
Bob D
You mentioned 2-2 1/2 hour run time and an equal amount of time to charge.
Almost all batteries are designed to safely take a 1C charge which means a 1000 mah is charged at 1 amp, a 2000 mah at 2 amps etc.  At a 1C rate a battery should charge in 1 hour.
Many batteries are in fact designed to handle a greater rate of charge.  
Also, if you are getting 2 1/2 hours on a 2000 or 2200 mah pack your engine is drawing less than 1 amp.  Not bad for the large O scale you describe.

Last edited on Fri Apr 21st, 2017 07:28 pm by Bob R



____________________
Bob
Back To Top

 Posted: Fri Apr 21st, 2017 07:29 pm
  PMQuoteReply
8th Post
Si.
Super Moderator


Joined: Thu Feb 23rd, 2012
Location: London
Posts: 3217
Status: 
Offline
Hi Guys :wave:


I was going to start off with something completely different ...

... but just so the Thread isn't totally derailed into yet another tedious debate about batteries ...

... here's the principle battery philosophy which I adopted for my project.



BUY THE CHEAPEST DAMN BATTERY YOU CAN ! ... PERIOD !!



So I did !


I got on eBay.

Typed in the simple search term 'LiPo Battery'

Followed by 'Worldwide Listings'

Followed by 'Cheapest First'

& about 2 minutes later, had bought the battery for the project !





The battery I bought, as far as I can tell, is the cheapest LiPo battery available on Planet Earth !

It is a 380mAh bog-standard 3.7 Volt LiPo battery.

The physical size is quoted as 40x20x7mm.

It cost me £1.36p inc. P&P !


End of story on batteries !!


At the moment, that's the subject of batteries DONE & DUSTED for my project.


:P


Si.


Am I worried about it blowing-up, melting-down, catching-fire or giving me nervous-twitches ?

NO I AM NOT !

It's just an ordinary everyday battery, just like TRILLIONS of others !!

:cool:

I did make a mental note of Herbs  :old dude: very sound advice on batteries though ...

... which was ... " Don't stab it with an Exacto-knife, as the goo pours out all over the workbench ! "

Thanks Herb !

I'm gonna be REAL CAREFUL to avoid that !! ;)




____________________

' Mysterious Moose Mountain ' - 1:35n2 - pt.II
http://www.freerails.com/view_topic.php?id=7318&forum_id=17&page=1

' M:R:W Motor Speedway !!! ' - 1:32 Slotcar Racing Layout
http://www.slotforum.com/forums/index.php?showtopic=59295&st=0&a
Back To Top

 Posted: Fri Apr 21st, 2017 10:52 pm
  PMQuoteReply
9th Post
Bob D
Registered
 

Joined: Wed Apr 1st, 2015
Location: Portsmouth, USA
Posts: 550
Status: 
Offline
Bob R wrote: Bob D
You mentioned 2-2 1/2 hour run time and an equal amount of time to charge.
Almost all batteries are designed to safely take a 1C charge which means a 1000 mah is charged at 1 amp, a 2000 mah at 2 amps etc.  At a 1C rate a battery should charge in 1 hour.
Many batteries are in fact designed to handle a greater rate of charge.  
Also, if you are getting 2 1/2 hours on a 2000 or 2200 mah pack your engine is drawing less than 1 amp.  Not bad for the large O scale you describe.

BobR,
I have both chargers set at 1C rate, I guess that's why it's taking that length of time.  I think the NiMh charger can be set to 2C, need to look at the LiPo charger.
If I could remember to do it I would keep time of how long I run each engine and when they get close to the 2-2-1/2 hour mark bring them in for re-fueling before they stop dead in their tracks and finish the session with another engine.
I'm really surprised that I get over 2 hours run time on a charge, all the gurus said it wasn't possible.  Maybe cause I don't use smoke in any of my engines.  Or sound, although I don't think a sound card uses a lot of current.  I did wire in a 2" speaker and sound module into my Williams E7 that has a BlueRail board and have seen zero affects on battery drain.

Last edited on Fri Apr 21st, 2017 11:02 pm by Bob D



____________________
BobD
O-SCALE BPRC
Back To Top

 Posted: Sat Apr 22nd, 2017 03:37 pm
  PMQuoteReply
10th Post
Bob D
Registered
 

Joined: Wed Apr 1st, 2015
Location: Portsmouth, USA
Posts: 550
Status: 
Offline
I just read that a 9.6v 2000Mah NiMh battery will hold up thru 1000 cycles.
If so, I take it I could run my engines 2+ hours every day for almost 3 years before having to replace the battery.
I started BPRC 2 years ago, at the rate I'm running my trains I may not have to buy a new battery ever!!!
I have 12 engines with batteries in them and another 6 I can convert.  At approximately $16 each that's $192 already spent and another $96 if I convert the other 6 engines, for a total of say $300.
That's not a bad deal when compared to a large AC or DC transformer or command control system needed to wire and run a layout.
I'm sticking with BPRC :glad:



____________________
BobD
O-SCALE BPRC
Back To Top


 Current time is 05:11 pm
Page:    1  2  3  4  5  6  ...  Next Page Last Page  

Freerails > Model Railroad Forums > R.C. Control - The Future Now If You Desire > Dr. StrangeLiPo ... or How I Learned To Stop Worrying & Love The Battery !
Top



UltraBB 1.172 Copyright © 2007-2016 Data 1 Systems