I recently made a video where I showed how I'm able to use my Variable DC power supply
to charge a variety of different batteries, and why it doesn't matter how high I set the voltage, so long as I set my current down low enough. If you already know what the ideal charge voltage should be, there is no point in using a higher than ideal charge voltage, but

since many of us may find ourselves in situations where we don't know what the ideal charge voltage should be, and we don't want to guess and possibly damage our batteries. Lowering the current assures us we will not damage our batteries no matter what voltage we use,.

The only down side to applying a higher than ideal charge voltage to your battery, is that your battery will have a non stop current being applied to it even after it reaches its full charged state.

At a low current setting it's not going to create an explosion, but it would be wasted energy and cause your battery to fall short of its normal life expectancy.

In this video I also talked about reversing the polarity to batteries that would not take in any charge current just to jump start them for a very short time interval, but I'd like to add it would be dangerous to do this for more than a few seconds, and it should only be done while cautiously observing the current flow into your batteries. Once you see the current starting to flow, I suggest shitching the the leads from your power supply back to the correct charge polarity to see if the battery will start to accept a charge. Sometimes I repeat this step a few times.

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