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First Lego League in Virginia and DC


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Charles Aldridge <[log in to unmask]>
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Charles Aldridge <[log in to unmask]>
Wed, 14 Oct 2009 12:45:24 -0400
text/plain (48 lines)
Teams using strategy to go under the low portion of the bridge (north wall) 
may benefit from using AA batteries because the lithium rechargeable battery 
pack adds about a 1/4" in height to the NXT brick.


----- Original Message ----- 
From: "John Barrett" <[log in to unmask]>
To: <[log in to unmask]>
Sent: Wednesday, October 14, 2009 9:58 AM
Subject: [VADCFLL-L] A note on rechargeable batteries

> Everyone,
> Just a heads up here.  Over the past two weeks, the pair of robots we use 
> have started to exhibit some strange behavior.  For example, turns were 
> becoming increasingly inconsistent and the robot would sometimes move in 
> jerky movements at slow speeds.  The robots are 3 and 4 years old and 
> initially we thought it might be a motor problem or possibly the new NXT 
> software.  Our teenage mentor suggested that the Lithium Ion batteries may 
> be going bad.  While we were initially skeptical, since both batteries 
> showed full charges, we replaced the rechargeable batteries with alkaline 
> batteries and the robots were back to their "normal" selves.  Aha!
> The lesson here is if you're using a robot with a rechargeable battery 
> that is a few years old and you see some strange behavior, try swapping 
> out the rechargeable with a new set of batteries.  It could save you and 
> your team from going mad.
> John
> -- 
> John J. Barrett
> Industrial Medium, Inc.
> 1616 Anderson Road
> McLean, VA 22102
> (c) 703-231-5094
> (p) 703-286-0818
> (f) 703-286-0888

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