Thread: How often do you change batteries?
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Unread 24-06-2002, 00:22
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#0047 (ChiefDelphi)
  
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Re: How often do you change batteries?
Posted by Al Skierkiewicz at 2/6/2001 1:24 PM EST


Engineer on team #111, Wildstang, from Wheeling High & Rolling Meadows High and Motorola.


In Reply to: How often do you change batteries?
Posted by Joe Ross on 2/6/2001 12:45 PM EST:



Now that Innovation First has provided battery monitoring on the interface we have come to trust this as the best indicator. During competition in 2000 we experimented with nondriving current draw that would give us terminal voltage under load. For us it was driving two Fisher Price motors at full speed. When the battery fell below 11 volts in this condition we became ready to swap, and below 10 volts was a mandatory swap. Remember that motors will run all the way down to zero volts but the interface has an internal 8 volt regulator. Fall below that voltage for a short time and you will reset the micro and wait for at least two seconds before the micro reboots. A good indication of reboot will be when the rotating light turns off.
Hope this helps
Al



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