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Unread 09-03-2002, 21:44
Unsung FIRST Hero
Al Skierkiewicz Al Skierkiewicz is offline
Broadcast Eng/Chief Robot Inspector
AKA: Big Al WFFA 2005
FRC #0111 (WildStang)
Team Role: Engineer
 
Join Date: Jun 2001
Rookie Year: 1996
Location: Wheeling, IL
Posts: 10,792
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To All,
I saw some disturbing reports here and I want to make sure everyone is on the same page.
To the team that is charging from dead to full in one hour, cease and desist. The internal heat from that kind of charge cannot escape or conduct to the outside quick enough for you to stop the charge when the battery gets warm. If you are able to full charge in an hour you are most likely charging at 18-20 amps. This amount of current if it doesn't blow the battery will surely damage internals. The kind of damage will show up when you least expect it, like out on the floor.
The specification from the battery maker is specified at 4 amps max. Last year's charger was a step charger and speced at 2 amps. At 2 amps, constant current charging, a dead battery should take about 8-10 hours to reach full charge. At 1 amp twice that length of time or 16-20 hours.
Good Luck All
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Good Luck All. Learn something new, everyday!
Al
WB9UVJ
www.wildstang.org
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Storming the Tower since 1996.