Quote:
Originally Posted by tuXguy15
Adciv
They aren't reaching 15v like we want. It goes to 13 for a charge and the second we take them off they drop to 12.6-12.8v and after 1 match they are below 12v. When we get low on voltage we drop to around 6-7v when the compressor runs.
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This is absolutely standard behavior for the batteries we use (and pretty much all 12 volt lead acid batteries).
All batteries all drop below 12 after a full match. If you are running a compressor, it will draw down the available voltage, as will any load placed on the battery. Batteries will drop when a heavy load is placed on them. With a completely charged battery, running 4 cims at stall or near it (say under full acceleration) will drop a fully charged battery down under 10 volts temporarily. Once that load is removed, it will return back up near it's previous point.
To me, it sounds like you're expecting some type of different behavior out of the battery, but everything I've read so far suggests these batteries are just fine.
Could you further clarify what you mean when you say your batteries have gone bad? Using them in the manner you are describing: charging to a surface charge of 13 (true charge of 12.6-12.8) then running a match, then recharging should absolutely not hurt your battery at all.
Indeed, if you read the specifications for the batteries we use (available at AndyMark to save you time) you'll see that the maximum charging voltage is 15 volts. However, once your battery is fully charged (amperage going into the battery is no longer increasing), your charger will drop to a floating voltage charge of 13.5 to 13.8 volts to keep the battery topped up.
These batteries will not read measure 15 volts acrossed the terminals when you are done charging them.