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Post  aungmyatoo on Sat Jun 29, 2019 11:05 pm

I want to use AA rechargeable batteries for cox engine starting.
So it begins:
Bought AA battery adaptors

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Post  aungmyatoo on Sat Jun 29, 2019 11:08 pm

And battery case, that meant for kits to experiment series and parallel battery connection.
It is useful for increasing array of batteries.
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Post  aungmyatoo on Sat Jun 29, 2019 11:12 pm

Finish product for the time being.
I still not satisfy with crocodile clips, later I will change to something else.
Wire, I used speaker wire which can handle high current

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Post  Oldenginerod on Sun Jun 30, 2019 1:56 am

Those "D" size battery boxes are a great idea, and so cheap.  I'm going to get a couple.   I won't bother with the AA batteries in the adaptor case, just use D size Alkalines. Two cheap "D" size wired together and taped up have lasted me a real long time.
And hey, when the batteries get too flat in parallel I can swap the boxes around and put them in series to get a final few starts from them. Thumbs Up
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Post  aungmyatoo on Sun Jun 30, 2019 2:46 am

Less than $3 per piece

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Post  aungmyatoo on Sun Jun 30, 2019 3:14 am

Oldenginerod wrote:Those "D" size battery boxes are a great idea, and so cheap.  I'm going to get a couple.   I won't bother with the AA batteries in the adaptor case, just use D size Alkalines. Two cheap "D" size wired together and taped up have lasted me a real long time.
And hey, when the batteries get too flat in parallel I can swap the boxes around and put them in series to get a final few starts from them. Thumbs Up

Careful with series batteries, it can burn off the filament in the engine head if over 1.5 volts.
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Post  Oldenginerod on Sun Jun 30, 2019 3:26 am

aungmyatoo wrote:
Careful with series batteries, it can burn off the filament in the engine head if over 1.5 volts.

Well aware of that.  I was young and stupid once (like most of us) and impatiently tried to start a stubborne engine with a little extra juice.  

I would only do it to get the last from my batteries once they were too flat to work in parallel. Just unclip the boxes from the side-by-side position and connect them end-to-end, and your two half flat (.75 V) batteries make 1.5 Volts.  Just trying to be a penny-pincher.
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Post  getback on Sun Jun 30, 2019 6:21 am

Good idea with the rechargeable AA Batts , alot of things i have take those same batts. So i bought a few and a charger / i don't know if the Ds would last longer though?
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Post  aungmyatoo on Sun Jun 30, 2019 9:11 am

Rechargeable battery has 1.2 volt compare to normal single use battery of 1.5 volt.
The plus point for rechargeable battery is less internal resistance so it can produce higher current / amperage in short period.

It won't last long compare to D size normal battery, any way we can recharge several time.
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Post  aspeed on Sun Jun 30, 2019 2:51 pm

I had thought of using a triple case that would use C cells, and stretching the springs to use the sub C cells. I guess it would be best to rearrange the cells to charge them. Can't forget to put them back to parallel before use. I still use the panel, but sometimes it is nice to have a more portable unit for control line stuff.
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