How do you charge a 12v AGM maintenance-free lead-acid battery?
I am getting a 12v ~12Ah AGM SLA battery for a project. I need to know how to charge it without damaging it. I need to be able to charge it from a wall source, and it would be helpful if I could charge it from solar/generators as well. Can I use any of the following methods? What are the consequences?
Wall power:
-a normal flooded-cell car battery charger?
-some special AGM charger?
-putting 12v in and measuring it manually? while controlling the current? what polarity, (+) to (+) or (+) to (-)?
Alternative charge methods: (less important)
-a solar panel?
-attaching motor to bike and pedaling? backwards?
Additionally, Is desulfation of the battery plates required for AGM batteries? If so, how?
The charging solution has to be cheap (in the $50 range.)
A fully charged 12 volt AGM battery's voltage should read about 12.7 volts. You should charge it with about 1 - 2 amps of charge current at charge voltage 14.2 - 14.4 Vdc then drop the current to a trickle and float the voltage at about 13.4 after full charge.
here is a nice charger in your price range, if you do a search you may find a better deal, but Northern is a well known company and from the description this charger will address all your concerns.
I would not use a charger that does not have current limiting, i.e. a normal flooded-cell car battery charger or any other method without limiting current. connect + to + and - to -.
have fun!
How can I tell if my lawn tractor battery is wet, gel or AGM type?
Neither of 2 batteries I have has a label that indicates its type, but a charger I just bought requires that I push a button to make a choice. The old battery has two rectangular caps on top, but I don't think they're supposed to come off, so its probably maintenance-free. The new one has nothing similar to that on its top. How do I know which is the safe setting?
Most lawn tractor batts are wet. If you are in doubt call the place that you bought it. Or go to the battery manufactor's website. All of the batteries that I have had for my tractors have had the two caps on top, they do come off and you can monitor the level of the liquid. Gel batts are usually way more expensive than wet batts.
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