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-   -   MK Battery Problems (http://www.chiefdelphi.com/forums/showthread.php?t=66541)

Al Skierkiewicz 03-04-2008 15:08
Re: MK Battery Problems
 
Mitch,
The spec is 11mOhm nominal so I wouldn't be too worried even up to 15 or 20 mOhm. However 5 ohms is way too high. I know the construction of this battery does make it possible to damage the terminal inside the red/black coating at each terminal. Picking up by the wire is a guaranteed failure.

Brandon Holley 03-04-2008 15:42
Re: MK Battery Problems
 
Just to reiterate, team 125 had 2 bad batteries go down on us at the boston regional.

One was from 2007 KOP the other from 2008 KOP. Other than that I dont have the exact details from them, however when put under load (with a load tester) we got a reading around 9 V for both of them.

dez250 03-04-2008 16:51
Re: MK Battery Problems
 
Brandon, when you use the load tester on an "in working order" battery, what is the "regular" reading you would get?

Tom Bishop 03-04-2008 17:14
Re: MK Battery Problems
 
Our 2 batteries from the 2007 KOP act like they have take a charge then when you put them on the robot the voltage immediately drops. I haven't load tested them, but we just don't use them now. They went dead while we were using them on our 2007 bot to practice in the fall. They've been charged on both a NAPA charger and the new Schumaker.

Starke 03-04-2008 18:57
Re: MK Battery Problems
 
To test the theory of a bad batch of batteries, here is the lot number for the bad batteries that SparX had.

Lot Number: 061009D

RyanN 03-04-2008 19:23
Re: MK Battery Problems
 
We dropped one of our batteries from last year. The little plastic strip on the top of the battery came loose, giving access to the cells. Later, that battery tipped over somewhere, and the acid poured out of it. When this happened, it still has 12V on the posts, but when we tried to move, it would reset the controller. Obviously, if there is a problem with a battery, then its either the posts or one or more of the cells.

EricVanWyk 03-04-2008 19:51
Re: MK Battery Problems
 
Quote:
Originally Posted by RyanN (Post 730020)
We dropped one of our batteries from last year. The little plastic strip on the top of the battery came loose, giving access to the cells. Later, that battery tipped over somewhere, and the acid poured out of it. When this happened, it still has 12V on the posts, but when we tried to move, it would reset the controller. Obviously, if there is a problem with a battery, then its either the posts or one or more of the cells.
Please do not continue to use a battery that has leaked. Please.

Gdeaver 03-04-2008 20:40
Re: MK Battery Problems
 
Team 104 had battery problems at the NJ regional. The 2 2008 and 1 2007 batteries failed on Thurs. They would charge but would be down half way through a match. Any battery that was charged on the 2008 charger failed. We made it through the regional on a 2006, 2007 battery and the 2006 and 2007 chargers. We are sure the common mode of failure was the 2008 charger.

RyanN 03-04-2008 20:53
Re: MK Battery Problems
 
Quote:
Originally Posted by EricVanWyk (Post 730031)
Please do not continue to use a battery that has leaked. Please.
We didn't realize that it leaked until we pulled it off the robot and I tried to figure out why it wasn't working. I knew the plastic plate on the top was loose, but I did not know the black rubber plug had come lose. I'm not sure if it leaked or it evaporated while charging. We disposed of the battery properly, and it is now in the battery graveyard.

metR 03-04-2008 21:04
Re: MK Battery Problems
 
At the boston regional we had some trouble with our charger. We would plug in one of the batts to charge, and come back later and the red "Check" light would be on. Unplugging the battery from the charger and charger from the wall solved the problem, but it did this at least twice. This caused trouble when we thought the batteries were charging, but were just sitting instead. We have the 2008 KOP charger and batteries.

IndySam 03-04-2008 21:27
Re: MK Battery Problems
 
Quote:
Originally Posted by Gdeaver (Post 730059)
Team 104 had battery problems at the NJ regional. The 2 2008 and 1 2007 batteries failed on Thurs. They would charge but would be down half way through a match. Any battery that was charged on the 2008 charger failed. We made it through the regional on a 2006, 2007 battery and the 2006 and 2007 chargers. We are sure the common mode of failure was the 2008 charger.
We had 2 of our 2007's fail. We did not use the 2008 charger, our batter cart has 6 of the old style chargers on it.

BTW 2006 batteries were illegal for competition this year.

MrForbes 03-04-2008 21:29
Re: MK Battery Problems
 
Quote:
Originally Posted by Gdeaver (Post 730059)
Team 104 had battery problems at the NJ regional. The 2 2008 and 1 2007 batteries failed on Thurs. They would charge but would be down half way through a match. Any battery that was charged on the 2008 charger failed. We made it through the regional on a 2006, 2007 battery and the 2006 and 2007 chargers. We are sure the common mode of failure was the 2008 charger.
THe new chargers are a bit tricky, you have to make sure the voltage is set correctly, and current is set correctly after you connect the battery.

Chris Fortmeyer 03-04-2008 21:50
Re: MK Battery Problems
 
Quote:
Originally Posted by fatjoe3833 (Post 729829)
Mark, was the second battery from spare parts okay? Maybe there was a problem with the chargers at SBPLI. I saw the spare parts people charging the extra batteries troughout Saturday. Maybe the batteries were abused or mishandled at another regional.

-Joe (Elimnation Match Spare Battery Guy)
Joe,

I am actually the member of the drive team that noticed the bad battery from Spare Parts. The robot was continually resetting and not staying on long enough to even get a voltage reading on it. The second battery from Spare Parts seemed to work fine, even though it was not fully charged at the beginning of the match.

Gdeaver 03-04-2008 22:17
Re: MK Battery Problems
 
We were not the only team having battery problems. Yes we were aware of the need to set the battery charger. I can't prove the 2008 charger was the problem. All I can say is that the batteries that were cycled on the 2008 charger failed. The ones which were not worked fine. As to the 2006 battery legality. We used what we had. We were not the only ones.

ebarker 03-04-2008 22:24
Re: MK Battery Problems
 
Quote:
Originally Posted by squirrel (Post 729907)
Just to keep things interesting, I'll mention that we discovered that the Andersen connectors this year are made differently from past years, and that we could get the power to the robot to go on and off by merely wiggling the Andersen connector with the new batteries, but it would stay working with the old batteries (which have the old connectors).
What was different about the connector ? Were the pins inserted into the shell correctly ? I'd like to see this thing ? Going to Atlanta ?


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