hey tim can i get some advice?  
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All Forums >> Radios, Batteries, Clubhouse and more >> Batteries & Chargers >> MRC Charger Product Support (i.e. Super Brain, etc) >> hey tim can i get some advice?
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hey tim can i get some advice? - 1/17/2008 7:38:05 AM   
Shroter



Posts: 51
Joined: 1/6/2008
From: Maine, ME, USA
Status: offline 		i got the 977 pro today along with a couple of batts...before i go and plug my new ones in im wanted to get familier with the charger with a junk tower hobby special....its a 1500mah Nicd 6 cell...

Heres my question....is there a formula i have to follow to discharge sucsessfully?...for some reason everytime a start a discharge cycle it runs for like 10 seconds and then comes to a "beeping" hault.

volts is reading 7.42....

Any help?....

Could you also include a formula for discharging Nihm's?

Thanks!
Jacob
       Post #: 1

RE: hey tim can i get some advice? - 1/17/2008 3:29:28 PM   
Tim@MRC


 

Posts: 345
Joined: 7/24/2006
From: Edison, NJ, USA
Status: offline 		The highest discharge rate on the 977 is 4 amps, so there really isn't that much of a drain on the battery. What's probably happenning is the voltage is dropping and the charger is shutting down. Pay attentuion to the voltage when it shuts off, it should be below 6.5 volts. It's typical that the battery will recover and the voltage will rebound back up to 7.2 - 7.4 volts. So even though the battery is considered discharged it will still show voltage. There really isn't a formula for discharging. You may need to cycle the batteries a few times if they've been sitting for a while, but otherwise just charge them up and run them. If you get new NiMH batteries, it's very typical for them to false peak on the first couple of full charges, until the voltage stabilizes. Just keep hitting the start button until the chager shuts off and the battery gets warms.
The 1500 mah NiCd battery, I would charge at no higher than 4.5 amps and use 50mv. Any other questions let me kow.

Tim Sandor

(in reply to Shroter)
       Post #: 2

RE: hey tim can i get some advice? - 1/17/2008 4:01:42 PM   
Shroter



Posts: 51
Joined: 1/6/2008
From: Maine, ME, USA
Status: offline 		Thanks!

(in reply to Shroter)
       Post #: 3

RE: hey tim can i get some advice? - 1/17/2008 4:27:15 PM   
Tim@MRC


 

Posts: 345
Joined: 7/24/2006
From: Edison, NJ, USA
Status: offline 		No problem.

Tim

(in reply to Shroter)
       Post #: 4

RE: hey tim can i get some advice? - 1/17/2008 11:25:39 PM   
Shroter



Posts: 51
Joined: 1/6/2008
From: Maine, ME, USA
Status: offline 		wait wait wait......so whats the point of the discharge cycle then?

< Message edited by Shroter -- 1/17/2008 11:26:10 PM >

(in reply to Shroter)
       Post #: 5

RE: hey tim can i get some advice? - 1/18/2008 1:57:44 PM   
Tim@MRC


 

Posts: 345
Joined: 7/24/2006
From: Edison, NJ, USA
Status: offline 		You can use the discharge if you don't run the pack down all the way and want to bring it down, or you want to test the batteries capacity to see if you've lost any of it's life. Also, sometimes it's good just to cycle the packs slow to help equalize the cells. So while you may not be using the discharge all of time, it's nice to have.

(in reply to Shroter)
       Post #: 6

RE: hey tim can i get some advice? - 1/18/2008 4:16:18 PM   
Shroter



Posts: 51
Joined: 1/6/2008
From: Maine, ME, USA
Status: offline 		right ok...

So then how do i get it to do a complete discharge is my question....it only stays on the discharge cycle for like 3m.....and then it turns off...and this is a fully charged 1500mah Nicd battery.

(in reply to Tim@MRC)
       Post #: 7

RE: hey tim can i get some advice? - 1/18/2008 4:24:00 PM   
Shroter



Posts: 51
Joined: 1/6/2008
From: Maine, ME, USA
Status: offline 		figured it out.....

Thank you for your time!

(in reply to Shroter)
       Post #: 8

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All Forums >> Radios, Batteries, Clubhouse and more >> Batteries & Chargers >> MRC Charger Product Support (i.e. Super Brain, etc) >> hey tim can i get some advice?
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