Re: Battery Chargers

Posted by Bob M on March 21, 2003 at 06:22:46 from (165.170.128.68):

In Reply to: Battery Chargers posted by Hugh MacKay on March 21, 2003 at 05:40:48:

Hugh -

Sounds like you got yourself a "cosmetically challenged" but fully functional unit! The voltage readings vs dial settings sound about right for a working battery charger. Here's how it might be utilized:

1 - "Low" settings (both 6 and 12 volts): Use to slow charge batteries. If you're not in a hurry this is the best way to bring up a down battery without putting undo stress on it. You'd typically let the battery charge for 12 - 24 hours on this setting

2 - "High" setting (both 6 and 12): Use to bring up a dead battery in an hour or two. Actual duration depends on initial state of charge, battery capacity and charger amperage on the high setting. You'd use the timer with this setting so you don't overcharge/damage the battery.

3 - The "medium" 12 volt setting I suppose splits the difference between #1 and #2. Not sure what it's actually useful for….

4 - "Boost" setting is to provide an extra kick to help a partially discharged battery start a vehicle. To use you set the charger to boost and let it charge the battery for a minute or two. Then crank the engine with the charger still connected and boosting. Note that boost is a limited duration function for the charger. The charger will eventually overheat and (should) cut itself off if the boost lasts more than a couple of minutes. Boost is also hardest on the battery.

The polarity light will come on if you've got the charger hooked to the battery backward and the battery is not completely flat.

Have fun, and don't forget that new knob for Mrs McKay's oven!

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