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- New Battery Technologies - What Do We Need ? -
 Moderated by: W C Greene Page:  First Page Previous Page  1  2  3  4  5  6  7  Next Page Last Page  
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 Posted: Sun Feb 1st, 2015 04:25 am
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dan3192
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I would add that the 4th generation Eneloops are now rated for 2,100 charge/discharge cycles. Also the old EneloopXX is now EneloopPro rated at 2,500 mAh and 500 charge/discharge cycles. There's an Eneloop Twicell battery available that is also 2,500 mAh. I've read that FDK now makes all Eneloop batteries.

I recently purchased some Powerex Imedion AAA batteries for extended run times. They are 950 mAh batteries compared to the 800 mAh Eneloops I started out with 2 years ago. That's an 18% increase In capacity, which is fairly decent.

The point is, batteries are rapidly improving, making battery power and radio control an increasingly viable option for running our trains.

Dan

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 Posted: Sun Feb 1st, 2015 10:07 pm
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dan3192
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Sorry if I'm beating a dead horse, but I found a lot of useful information about Eneloops I hadn't seen before at the following link:

http://budgetlightforum.com/node/7336

General Conclusions (my own):

1. If you can live with lower capacities, don't want to manage batteries when charging/discharging, dread the thought of losing an engine or car to a Lithium battery mishap, prefer to spend less vs more on batteries, have the space to get the voltage and/or amps you need, or want to use the same batteries for your phones, flashlights, TV controllers, toys, computer mouse, etc - go with NiMH (low self discharge) batteries.

2. If you want maximum capacity, can find the right size for your model from what's available, are willing to be cautious about battery charging, discharging and storage, are not dealing with irreplaceable models, find that space is most important for what you want to accomplish, want long run times, or need the highest voltage you can get for the space available - go with Li-ion or LiPo batteries.

Nothing wrong with using both types - I do. It's your choice - to suit your needs.

Dan  

 

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 Posted: Mon Feb 2nd, 2015 04:41 am
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Pete Steinmetz
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Dan:

Thanks for your research. Ni-MH would be preferable to Li Poly except most of us don't have the space for AA or AAA cells.

To make a 12V pack, you would need 10 Ni-MH cells vs 3 Li Po cells for 11.1V

1.2V per cell for Ni-MH vs 3.6 or 3.7 for Li-Po.

Pete Steinmetz



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 Posted: Mon Feb 2nd, 2015 05:50 am
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Tramcar Trev
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And to be sensible about this Li Ions and Lipos can explode but the likelyhood of them doing so is remote for the purpose you want to use them. ANY BATTERY can explode if its charged to quickly or abused (hit or had its casing damaged) or by drawing excessive current eg 10 amps from a 2A/H battery.... In practical terms they are quite safe. Just exercise normal care with charging and use. Yes I know there have been examples of mobile phones bursting into flames but ask how many mobile phones are there world wide and how many self destruct and then ask can you live with the risk...



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 Posted: Tue Feb 3rd, 2015 01:15 am
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bobquincy
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We can't let this thread die quietly or easily.

For energy per weight there is no challenger to LiPo and for airplanes and race cars that is a big deal. For trains however, weight is not so much an issue, volume is. LiPo, Li-Ion, and NiMH are all close for energy per volume. Compare a AA NiMH at 2500 mAH and 1.25 V (14 mm diameter x 50 mm long) with a Li-Ion at 800 mAH and 3.7 V (same size) with a LiFe (15x15x53) and a LiPo (43 x 25 x7) and we see all but the LiFe are close in volume!

Of course these numbers are not absolute and some LiPo are somewhat smaller than NiMH per energy, maybe 25%. The numbers keep changing as new chemistries are formulated and as the marketing departments make up new claims. ;)

Me, I use all of the above (except LiFe, so far) for various projects but there may be no clear winner.

boB

Last edited on Tue Feb 3rd, 2015 01:19 am by bobquincy



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 Posted: Sat Feb 14th, 2015 10:57 pm
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Budd
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mwiz64 wrote: _Speed Control:
http://www.hobbyking.com/hobbyking/store/__32025__HobbyKing_X_Car_45A_Brushed_Car_ESC.html

Questions for Mike and Trev,
  • Any issues with this ESC on 3 cell (11.2V) batteries, R/C cars generally only run 2 cell.
  • Can you get smooth control right thru the speed range, ie, are they ok for shunting etc.
  • Do you know if they have any short circuit protection.
  • When used in cars they generally require another smaller battery pack (4 x AA) to power the steering servo, I presume this isn't needed in this application.
Question for DaveT,
  • Can your TX's bind with any DSM2 RX and vice versa, can your RX's bind with any DSM2 TX?
Wayne



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 Posted: Sun Feb 15th, 2015 02:24 am
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Tramcar Trev
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I have not used that one. I have used this one; http://www.ebay.com.au/itm/RC-ESC-10A-Brushed-Motor-Speed-Controller-for-RC-Car-Boat-W-O-Brake-/261210546358?pt=AU_Toys_Hobbies_Radio_Controlled_Vehicles&hash=item3cd15ca0b6
And it does the job running of my track voltage of 13.8VDC BUT I only draw an amp or so through it. May not like it if you tried to run 10 amps at 12V...
For railway use you DO NOT NEED A BRAKE in fact the brake will bring you to a shuddering halt.

I have also use this one; http://www.ebay.com.au/itm/hobbywing-brushed-Eagle-20A-ESC-for-RC-airplane-plane-/191022652814?pt=AU_Toys_Hobbies_Radio_Controlled_Vehicles&hash=item2c79d65d8e

more expensive but generally better overall but does not have reverse but as I have to swing the trolley poles I use a manual dpdt switch anyway.

A mate of mine swears by these ones that are a tad too large for me to use and they run happily on 12V if you're only pulling a couple of amps through them and they also have a nice smooth linear response; http://www.ebay.com.au/itm/1-8-1-10-RC-Car-Truck-Boat-320A-Brushed-Brush-Speed-Controller-ESC-W-Reverse-/361119667349?pt=AU_Toys_Hobbies_Radio_Controlled_Vehicles&hash=item541468d495

Its true you do not need separate power supply for your Rx, the bec (battery elimination circuit) takes care of that for you when you plug in to the Tx...



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There once was a man who said Damn!!
I perceive with regret that I am
A creature that moves
in predestinate groves
I'm not a Bus, I'm a tram
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 Posted: Sun Feb 15th, 2015 08:25 am
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DavidT
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Yes Wayne.
Regards, David.

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 Posted: Fri Feb 20th, 2015 11:01 pm
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Tramcar Trev
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This is not new technology but it does allow you to make up your own battery by fitting cells where ever you can to get the "battery size you need" Good prices too: http://www.hobbyking.com/hobbyking/store/RC_PRODUCT_SEARCH.asp?searchType=10&strSearch=+single+cell&location=AL&idCategory=

You can also get "protection boards" for these cells that are soldered across the terminals of each cell to prevent over discharge, over charge....



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There once was a man who said Damn!!
I perceive with regret that I am
A creature that moves
in predestinate groves
I'm not a Bus, I'm a tram
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 Posted: Sat Feb 21st, 2015 12:18 am
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Pete Steinmetz
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Tramcar Trev wrote:
This is not new technology but it does allow you to make up your own battery by fitting cells where ever you can to get the "battery size you need" Good prices too: http://www.hobbyking.com/hobbyking/store/RC_PRODUCT_SEARCH.asp?searchType=10&strSearch=+single+cell&location=AL&idCategory=

You can also get "protection boards" for these cells that are soldered across the terminals of each cell to prevent over discharge, over charge....


You get what you pay for. I have had premature failure with packs from Hobby King. These are RC cells. They are not commercial grade cells. I'm sure you can find sources for better quality commercial grade cells. Cost will be a little more, but quality will be better.



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