|
Re: when the battery is said fully charged?
[email]wenmang@yahoo.com[/email] wrote:
[color=blue]
> I am wondering when the battery is said fully charged?[/color]
The [url]www.batteryfaq.org[/url] should have the information, but here is state
of charge verses voltage information:
12.6V >75% charged
12.2V 50%
12.0V 25%
11.7V 0%
Measurements taken only a few hours after the engine has been turned
off will read higher because of surface charge, so when in doubt turn
on the headlights for 30 seconds and then turn them off before
measuring.
The battery should also be tested under load by turning on the high
beams, ventilation fan on high, and rear window defroster but not
running the engine. The voltage should remain at 9.5V or higher for
at least 30 seconds.
The final charge rate can be a better indicator of battery condition
but requires use of an automatic charger with an ammeter. A final rate
of less than 1A after several hours indicates good condition, but a
battery over 5 years old can still fail suddenly. Ammeters found on
chargers aren't highly accurate, but a final meter reading of over 2A
after overnight charging likely predicts failure within 6 months.
|
