This is to help de-stratify the electrolyte, such as after topping off a battery - otherwise the fresh water just floats on top. [This is for wet lead-acid, not sealed or gel]. Good to do periodically anyway.
I have a bunch of old laptop chargers - they all put out somewhere between 15 and 19 volts and about 65watts, so I just added clips in place of the plug (use a voltmeter to establish +- - usually + is the inner wire). After about 10min, the electrolyte was bubbling nicely. The charger gets a bit warm as it will definitely put out maximum amps when confronted with a large battery, but for these short periods of time, should be fine.
Don't leave it plugged in, wear gloves and goggles, open the caps, and don't do this in an enclosed space - explosive H2 could build up. This is just to run for a few minutes to mix up the electrolyte. If you don't have one lying around, Amazon has them for about $7-$12 ea (HP chargers are a good bet)
Cheers,
-Keith
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