According to Lego, the Mindstorms battery should be good for over 500
charging cycles. If you're recharging it once a week, that's about 10
years. These batteries do wear out from corrosion and chemical changes
as well, though, so I wouldn't expect one to last that long.
You can check the charge level of the battery from within the NXT
programming environment. If recharging brings the battery voltage to a
reasonable level, close to 9V, and the level doesn't drop rapidly as
the robot is being used, then the battery's probably OK.
If you're going to buy a new battery, be sure to recycle the old one.
On 5/16/10 1:26 PM, Sonya Shaver wrote:
[log in to unmask]"
type="cite">I have no information as I am seriously
battery-challenged. But I wanted to add that I would love to know
also. I think that from what others have said, it seems like after a
couple of years the rechargeable battery doesn't work as well anymore.
It kind of wears down and doesn't charge as well over time. We are
entering Year 3 with our current robot and battery, so I was thinking
about buying a new battery before the start of the season. I don't
honestly notice any difference in the performance of our battery as of
yet, however, I don't want to have chaos in the middle of the season!
So I thought maybe starting with a fresh battery would be better.
So, I would love to know also!
Sonya Shaver in Harriosnburg
On Sun, May 16, 2010 at 8:10 AM, Eric Palmer
<[log in to unmask]>
appears as if Lego has a new recharable battery with 2100mAh of power
compared with the original 1400 mAh
At the first site for team registration, products page there is a
charger and battery listed this way
--- NEW BATTERY ---
Rechargeable AC Battery
* US 979798
* $54.95 USD
This battery is for robots purchased prior to the Body Forward season.
And there is a charger listed the same way.
The lego Education Store lists this original batter this way
This rechargeable lithium battery is designed for use with the NXT
Intelligent Brick. The battery features 1400 mAh of power and an A/C
for direct power supply. The battery will charge from 0 to full in a
of four hours. Use the 979833 AC Adapter to charge the battery (sold
--- ORIGINAL BATTERY ---
Then there is another battery and charger listed this way
Rechargeable DC Battery
* US 979693
* $54.95 USD
The above one is a NEW Battery that the Lego Education Store describes
Designed for use with the NXT Intelligent Brick, this lithium ion
battery with DC plug gives you an alternative to normal AA batteries.
battery features 2100 mAh of power and uses the Transformer 10V DC
to charge. Estimated recharge time: 4-5 hours. Is not compatible with
The description on the FIRST site leads us to believe that the new
can't be used with the older NXT bricks. But the Lego Education site
explains that the chargers have to be matched up.
Does anyone have any additional information on these batteries?
Eric F. Palmer
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