Posted by karl f on February 25, 2011 at 23:09:08 from (172.162.38.154):
In Reply to: o/t Advanced Auto parts posted by huntingreen2day on February 25, 2011 at 22:15:52:
The advanced person is almost right, a fully dead battery needs more than an hour to be fully charged. 6 to 8 hours is more like it. There is no memory. A battery is an energy storage device, it can release a huge amount of energy at once and it takes a lot of energy to replenish it if greatly depleted. Due to chemistry, each cell is over 2 volts at full charge, so a fully charged battery is 12.4 to 12.6 volts. When a battery reaches 12.0 volts, it is considered dead. Even expensive electronic testers cannot test a dead battery. You need to charge your battery overnight and check for a charging malfunction or draw on the vehicle. Leave the battery disconnected from the vehicle when charging this time. Then in the morning reconnect, go straight to store for testing. They may be able to test alternator output too. If battery tests good, you'll have to double check vehicle. Disconnect battery for a few days if you don't use vehicle, and battery should stay fully charged if it is not bad. Try to have good attitude at store (hard to do I know) and hope that helps you get best help.
also remember that an alternator is not designed to recharge a fully discharged battery. They are merely a maintainer. The amp rating is intermittent duty and the components don't hold up well at full output except for brief bursts.
Now about that employee, making things up and using technical terms that are absolutely wrong is my pet peeve, especially when used showing off or to assert superiority. It's hard enough to teach the facts sometimes and what about someone that believes the bs because they don't know better? We had a training video about batteries where the narrator was talking about "acid gnomes" to explain surface charge; I decided forget this and have no respect for my company's training programs any longer.
warranties are getting tougher though, as many manufacturers are deciding not to reimburse stores for warranty costs paid to customers.
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