Posted by Steve@Advance on March 14, 2019 at 14:04:40 from (24.182.105.179):
In Reply to: agm battery charging posted by Mike M on March 14, 2019 at 10:39:10:
This looks like some reliable info once you get beyond the advertising for their charger.
Several categories to look through. It doesn't appear any special equipment is needed, but I would be careful not to hit it with too many amps. Low and slow charging is better for any battery.
Desulfating is also good for AGM batteries, so your charger should work fine.
One thing that is cautioned against is letting an alternator bring up a discharged battery after a jump start. Though it gets done countless times a day, it has a couple of disadvantages.
One is it over works the alternator. It is only designed to maintain the charge. It is happiest when the battery is fully charged, and all it has to do is replace what was lost when cranking and overcome the normal discharge of the vehicle accessories. If it has to supply the accessory load AND bring up a discharged/defective battery, it can overheat the windings, rectifier, electrical connections, and the drive belt.
The other problem is modern alternators are very high amp output. Not like the old days when alternators were in the 30-50 amp range, the newer ones are capable of 100+ amps on some models. All the alternator knows is voltage reference. If the voltage is low, it will go full amps trying to bring it up. Back to the "low and slow", nothing low and slow when it's getting hit with 100 amps!
But, your lawn mower probably only has a very low output alternator. It may not even have a regulator, just a rectifier. It is sized to handle whatever accessory load is needed, usually just a magnetic PTO clutch and maybe some lights. The danger is starting out with a discharged battery, then loading the electrical down with the PTO clutch. There may not be enough to fully seat the clutch, it slips and overheats. Plus over working the alternator windings and rectifier.
If it had enough to start after a short run, the battery is probably still healthy. I would just put a slow charge on it until it will hold about 12.4 volts with the charger off. It should be fine.
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