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October 2009

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Subject:
From:
Charles Aldridge <[log in to unmask]>
Reply To:
Charles Aldridge <[log in to unmask]>
Date:
Wed, 14 Oct 2009 12:45:24 -0400
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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.

Charlie

----- 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
>
> http://www.industrialmedium.com

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