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Old 03-31-2012, 11:22 PM
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Wheel Wheel is offline
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Battery Charger Blues

My little ol battery charger "Full Charge Light" comes on when the battery is still about dead. Everything is clean and have good connections so, is the battery charger ready for battery charger heaven. I've had it about 16 years.
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Old 04-01-2012, 05:54 AM
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Perhaps it is the battery; if the battery has lost a cell, the charger may not be able to understand the voltage it is receiving and gives up.
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Old 04-01-2012, 05:57 AM
thcardoc thcardoc is offline
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Grab a volt meter and directly measure the output from the charger while it's connected to a known good battery, plus watch how the charger operates with it connected to a good battery. Then go back to the dead battery and do it again. As a battery charges up, it's voltage rises and it will draw less current from the charger. The lamp in your charger is likely set to turn on at a specific voltage, (somewhere in the 12.7 to 13.2v range). A battery can have an internal failure that causes it to not take a charge and to the charger it can look like it's fully charged.

Last edited by thcardoc; 04-01-2012 at 05:58 AM.
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Old 04-01-2012, 08:05 AM
dougbfresh dougbfresh is offline
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Time for a new battery charger, the technology of battery chargers has changed a lot in 16 years.
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Old 04-01-2012, 10:03 AM
olddog olddog is offline
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Not much to an older battery charger and I have seen batteries act like they are charged and go dead with the least current load.

My money is on a bad battery.
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Old 04-01-2012, 01:20 PM
dougbfresh dougbfresh is offline
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The newer chargers will tell you if there is a bettery problem. The really old ones, tha ampmeters just would not move on a dead battery.
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