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#1
18-05-2013
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Dangerous connection?
Hello all;
I was wondering if any one could offer advice. I am running nimh cells, not lipo and I have soldered the cells to the motor and speedo, so no deans or any other type of connectors are used. I have also soldered the speedo on off switch lead together so it is always on, so everything is always on and connected. If I then charge the cells with everything hooked up would it damage the speedo in any way? Thanks! 
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#2
18-05-2013
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Just for starters that is unsafe plus leaving your batteries permanently connected and on will kill your batteries.
__________________
dragon paints : team tekin : fusion hobbies :SCHUMACHER RACING : Nuclear R/C for all my sticky and slippery stuff - if it needs gluing or lubing, Nuclear RC is the man!
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#4
18-05-2013
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Very bad indeed, you can't equalize the cells when they are in the car and because of the minute fallback allowed per cell is 0.03 volt. After a couple of runs they won't be equal voltage and when you charge you've a couple of cells that will peak early so they'll get over charged. They will either vent and be ruined or explode.
NIMH cells are useless, unstable and can be hell of a lot more dangerous than lipo cells. They are the worst thing to happen to the hobby IMO.
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#5
18-05-2013
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Leaving nimh cells permanently connected will drain them, and going below 0.9v per cell will damage them and quickly shorten their life.
Having everything permanently connected means when it's not running it is still switched on, so with any interference there's nothing to stop it disappearing all by itself, and I wouldn't want to try working on a car that's still turned on. There's no need to ever remove connectors from the wiring. Decent connectors are as reliable as a soldered joint, and with no more resistance than solid wire.
__________________
Visit my showroom
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#6
18-05-2013
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I agree with all the comments posted so far.
the way chargers charge Nicads and NiMh is by looking for a small voltage drop (deltaV) which tells the charger that the cells are full. If your speedo is connected and on, including other loads via the receiver, this could well confuse the hell out of the charger meaning you wont be able to fully charge or massively overcharge the batteries. Also even the slightest load for a long time will definitely flatten the batteries to a point where they can be damaged. Finally, removing any mechanical way of disconnecting your batteries from your car introduces the possibility that you could end up ruining everything in the event of any damage/electrical failures which do happen. I have to ask, what were your justifications for doing things this way in the first place, your either in need of a lot of help from your local shop/club or you are winding us up!
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#7
19-05-2013
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#8
21-05-2013
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Oh..... Justification, the pictures on the box of associated cars are always wired that way......
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#9
21-05-2013
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Quote:
Daily sport said if you eat glass you will shit diamonds,please feel free to try that one too.
__________________
MBModels - Schumacher Racing - Vapextech.co.uk - MRT - Savox - SMD
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#10
21-05-2013
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Quote:
As others have said repeatedly, you will damage the cells. Not to mention the chance of your car driving off by itself!
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#11
21-05-2013
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It wasn't uncommon at all to "hard solder" cells into cars - however, you wouldn't do it unless you had a switch, and you wouldn't leave them soldered / in the car to charge.
EFRA and BRCA then bought in a rule banning it, as they said there needed to be a means of disconnecting if something blew up.
__________________
Matthew White
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#12
21-05-2013
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Youve all made the point very clear thanks,
But very irresponsibale of Associated to market their products that way.
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#13
21-05-2013
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Quote:
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