checking a batteries voltage.
02-21-2011, 03:53 PM
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checking a batteries voltage.
i just got a multimeter, and i have read through the paper it comes with, but it only says things about warnings and the such. does anyone know or have one of these multimeters and help me to find out how to check the voltage of my 7cell 3000mah NIMH battery please? Thanks!!!
02-21-2011, 04:16 PM
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RE: checking a batteries voltage.
put it on the volts setting and shove one probe in each hole on the battery connector
DC volts setting, and the bottom 2 ports on the meter
DC volts setting, and the bottom 2 ports on the meter
02-21-2011, 04:16 PM
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RE: checking a batteries voltage.
Ill give you one tip ..
Dont let the metal ends touch while testing the battery plug..I did the cell expanded and i just made it outside with the pack before it blew lol
Dont let the metal ends touch while testing the battery plug..I did the cell expanded and i just made it outside with the pack before it blew lol
02-21-2011, 04:44 PM
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RE: checking a batteries voltage.
oh wow lol. don't want that to happen. how can i prevent that from happening, like keeping them very far away from eachother and keep them lined up straight?
] take your time and you should be fine 
02-21-2011, 05:15 PM
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RE: checking a batteries voltage.
<div style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; padding-top: 0px; padding-right: 0px; padding-bottom: 0px; padding-left: 0px; background-image: initial; background-attachment: initial; background-origin: initial; background-clip: initial; background-color: rgb(255, 255, 255); font-family: Arial; font-size: 12px; ">okay thanks. this is a pretty stupid question, but the pack does need to be fully charged right?</div>
02-21-2011, 05:29 PM
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RE: checking a batteries voltage.
ORIGINAL: electricrc68
<div style=''margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; padding-top: 0px; padding-right: 0px; padding-bottom: 0px; padding-left: 0px; background-image: initial; background-attachment: initial; background-origin: initial; background-clip: initial; background-color: rgb(255, 255, 255); font-family: Arial; font-size: 12px; ''>okay thanks. this is a pretty stupid question, but the pack does need to be fully charged right?</div>
<div style=''margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; padding-top: 0px; padding-right: 0px; padding-bottom: 0px; padding-left: 0px; background-image: initial; background-attachment: initial; background-origin: initial; background-clip: initial; background-color: rgb(255, 255, 255); font-family: Arial; font-size: 12px; ''>okay thanks. this is a pretty stupid question, but the pack does need to be fully charged right?</div>
02-21-2011, 06:32 PM
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RE: checking a batteries voltage.
Checking the voltage out of the car is only one data point. You need to try and check voltage under load. Plug the battery in your car, and probe the voltage somewhere between the battery and speed control (if you can) when you are giving the car some throttle. On good batteries, the voltage will hold steady. On bad batteries, the voltage will drop immediately because the cells cannot handle the load.
02-21-2011, 06:42 PM
#11
RE: checking a batteries voltage.
But, you should be able to tell by the performance of your titan by just telling if you are getting a decent amount of torque or throttle response. And at the end of the run, the battery shouldnt be hot.
02-21-2011, 07:29 PM
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RE: checking a batteries voltage.
So I have the pack out of a Traxxas Slash, a 3300 mAh 6 cell NiMH, at full charge it would read 7.2volts, what should this be discharged to. I think you discharge to .9 volt per cell, is this correct? So discharge to a reading of 5.4 volts? Thanks.
02-23-2011, 11:55 AM
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RE: checking a batteries voltage.
I have a couple decent DMMs, but bought one of those same Harbor Freight Centech things for $3. The original battery lasted for over 5 years, and I used it all the time. It was even left on accidentally a few times. The leads that came with it were the weak point. Still works fine, and tests some things that my other DMM in the garage can't seem to do without giving bogus readings. Not bad.
02-23-2011, 12:07 PM
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RE: checking a batteries voltage.
ORIGINAL: Finliefanatic
So I have the pack out of a Traxxas Slash, a 3300 mAh 6 cell NiMH, at full charge it would read 7.2volts, what should this be discharged to. I think you discharge to .9 volt per cell, is this correct? So discharge to a reading of 5.4 volts? Thanks.
So I have the pack out of a Traxxas Slash, a 3300 mAh 6 cell NiMH, at full charge it would read 7.2volts, what should this be discharged to. I think you discharge to .9 volt per cell, is this correct? So discharge to a reading of 5.4 volts? Thanks.
I was always told not to discharge nimh too often as they will lose runtime quicker.
Also every pack is different qualityiwse ive had 6cells(7.2v) that have read over 7.8-8.0v my 9.6v packs always read over 10v off the charger.
I use a Fluke 175 true rms mulimeter for readings.
02-23-2011, 04:22 PM
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RE: checking a batteries voltage.
ORIGINAL: Crapxxas19
But, you should be able to tell by the performance of your titan by just telling if you are getting a decent amount of torque or throttle response. And at the end of the run, the battery shouldnt be hot.
But, you should be able to tell by the performance of your titan by just telling if you are getting a decent amount of torque or throttle response. And at the end of the run, the battery shouldnt be hot.
02-24-2011, 05:54 PM
#16
RE: checking a batteries voltage.
I bought one of the cheepo harbor freight ones and I keep it in my box. Best 3 dollars I have spent on my batteries. Use it all the time to check if my lipos are charged.
@ tiger: how much did that fluke set you back? I'm lookin at getting a new meter after I graduate my automotive program
@ tiger: how much did that fluke set you back? I'm lookin at getting a new meter after I graduate my automotive program
