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Electronics => Electronics => Topic started by: airman00 on August 08, 2007, 06:01:32 AM

Title: Make two batteries share the same ground
Post by: airman00 on August 08, 2007, 06:01:32 AM

To make two batteries share the same ground do I just take the negative wire from a AA battery and connect it to groundl and then  take the 6V 20Ah battery's negative wire and connect that to the same ground? Will this make a common ground or will this just fry my components?

Title: Re: Make two batteries share the same ground
Post by: czwalga00gt on August 08, 2007, 09:48:51 AM

Edit:  just saw you're using AA and a high amp hour battery.  I dont think I would can do that.

Title: Re: Make two batteries share the same ground
Post by: HDL_CinC_Dragon on August 08, 2007, 12:06:48 PM

As far as I know, theres nothing wrong with that unless they are in series with each other...

I think as long as theres a load that also connects to that same Ground your fine... wait for Dunk or someone more experienced to confirm this though

Title: Re: Make two batteries share the same ground
Post by: hgordon on August 08, 2007, 01:13:43 PM

Having a common ground for all of your circuits is generally a good design practice, especially if you have a metal chassis.

Title: Re: Make two batteries share the same ground
Post by: Admin on August 11, 2007, 09:07:44 AM

The first thing I always check when someone's circuit is acting funny is if they have uncommon grounds. :P

yeap, connect the negative end of both batteries . . . but do not connect the positive ends together of any different type battery (or even the same type batteries with different levels of charge). What happens is one battery keeps trying to charge the other because they discharge at different rates . . .

Quote

6V 20Ah battery

sounds dangerous . . . is it lithium ion? or a typo?