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Batteries for HO GP9
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 Posted: Thu Nov 2nd, 2017 06:10 pm
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Bob R
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Geoff L wrote:
I was looking for a 2s lipo battery but am finding it difficult to source by size rather than capacity. In the alternative, the idea of switching cabooses has its attractions.

Geoff

Not difficult.  The standard method of numbering Lipo cells is the actual size.  I am using a lot of 250mah cells #402035 which translates to 4mm x 20mm x 35mm (H x W x L).  Round cells like Dan suggested 18500 is 18mm x 50mm.
I search a size number on ebay.  I am purchasing individual cells and soldering into a two cell pack adding a battery protection circuit board.  Very simple, safe and reliable.
Picture shows a 2S lipo with protection circuit and charge jack in bottom of one of my engines.  For size reference the mechanism is a Bachman HO Thomas the Trains Percy 040.

Attachment: 20170525_195200_resized (2).jpg (Downloaded 76 times)



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 Posted: Thu Nov 2nd, 2017 09:39 pm
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Geoff L
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Thank you all for the further useful advice.

With my British stock - ex Lima diesels and various 0-6-0 and 0-4-2 tanks I am using 2s 450mAh batteries with DT Rx62-22 receivers. I have toyed with making up battery packs, but as it has been early days have tried to stick to factory assembled packs.

The main use will be shunting/switching but probably with only one or two locos live at a time, hence search for max battery power.

Geoff

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 Posted: Thu Nov 2nd, 2017 11:19 pm
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Rod Hutchinson
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My 2S battery materials designed to fit into a trailing wagon for HOn30 size.  Battery is setup with 3rd terminal for balanced charging.
R/C components.  L-R bottom, Polyswitch Fuse, Switch to isolate RX from battery, Pololu 9v step up, Deltang RX 6x.xx, circuit board

Last edited on Thu Nov 2nd, 2017 11:19 pm by Rod Hutchinson



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 Posted: Fri Nov 3rd, 2017 08:20 am
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William M
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Google aDverts for 9v PP3 of 800 milliamps batteries rechargeable via a USB . 
You can obtain the correct lead for charging as well. Worth a look. They also have a 400 milliamp PP3 USB  rechargeable.
Might do the job....Prices vary quite a bit from seller to seller  see here also.
https://www.aliexpress.com/popular/usb-battery-rechargeable.html

Last edited on Fri Nov 3rd, 2017 08:33 am by William M



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 Posted: Fri Nov 3rd, 2017 09:45 am
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Helmut
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Those 6F22 cells are far too clumsy for most of the H0 and smaller scale models. They use  the same stepup technique as mentioned here. The price is much higher, though. A combo of a 1S Lipo and a Pololu ( or whatever ) 9V-stepup may be easier to fit and lead to the same results at less costs.



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 Posted: Fri Nov 3rd, 2017 05:10 pm
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Si.
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Just a comment ...

... which many people don't actually know.



The PP3 typical 9-Volt battery ...

... is in fact a packaged 'stack' of 6x small 1.5-Volt cells.



Not sure about what cells would be used in the 'package' for a re-chargeable PP3 ?

But it would be a 'stack' of smaller ones for sure.



:!:



Si.



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 Posted: Fri Nov 3rd, 2017 07:28 pm
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dan3192
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Check Helmut's link, sent earlier today...

...the Okcell by Banggood - two LiPo cells with a protection board, tested on YouTube, about 2.9Wh (9V x 322mAh).

https://www.youtube.com/watch?v=CR3l82x88xg

Dan


Last edited on Fri Nov 3rd, 2017 11:01 pm by dan3192

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 Posted: Wed Nov 8th, 2017 04:13 pm
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Geoff L
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Hi All

Thank you for the further advice. I have updated my Mynis Cule Magna post with details of some recent stock running tests and added further pictures to the link showing my rebuilt controller, two of my converted locos and some views of the layout under construction.

Regards

Geoff

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