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guys i bought a 12v 1500mAh Ni-MH battery pack for my first robot it has 3 wires ,black,red and white.i don't know what is the purposes of white wire(i guess red and black are for output).can someone tell me how to use theses three wires properly.i haven't use a battery pack before.and also can some one give me a circuit diagram to make a charger for this battery pack please.thanks.P.S. I'll attach a photo of battery pack here.
well i have a multimeter. i found that it shows 10.92 volt when positive lead to red wire and negative lead to black wire.and also it shows 10.92 when positive lead connect to red wire and negative lead connect to white wire.but it does not give ay readings when leads of multimeter connects to white and black wires
it displays 10.92v not 1.09v i dont have LM317 but i'll buy one if necessary
Hi,Quote from: aruna1 on February 14, 2009, 12:15:02 PMit displays 10.92v not 1.09v i dont have LM317 but i'll buy one if necessary10.92V for 10 cells equal a cell voltage of 1.09VWhen dealing with batteries, it gets easier if you refer to cell voltage, as it will be the same no matter the number of cells you use.I hate to repeat myself, but...Did you measure the resistance between black and white wire?Did the label say anything?Where did you buy it?Have you asked about the white wire there?
Hi,Strange!To sum up what you said:Black to red potential = 10,92VWhite to red potential = 10,92VBlack to white resistance = ¥ W (or >20 MOhm I assume)If that is indeed correct (sure about probing it right?), there seems to be diodes in both the black and the white leads with the cathodes directly at the 0V end of the battery and black and white leads on an anode each.Can you see any bulges that might be diodes through the wrapping?I looked at the pic once more, and it seems that the red lead is of a larger diameter than the other two - is that so or is it just an optical illusion?
nope no diodesand wires are same diameterguess it was made to be wierd
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The white lead can usually be safely ignored, as it is a temperature sensor, used to determine if the battery is too hot.As yet I haven't worked out how it works, as the data sheet I have doesn't actually mention this feature!
(Note that this is for Lithium Ion batteries, and may not apply to other types.)p.s. that's a lot of CAPTCHAS!