On Friday, November 6, 1992 at 12:55:57 PM UTC-8, James W Gourgoutis wrote:
I want to buy a 12 volt, 3 amp-hour lead acid battery to use in a
lighting system that I am building. Following the 1/10th rule, I need to use
a charger that delivers 300 milliamps. I have a wall converter that is rated
at 300 milliamps & 12 volts. Can I use this to charge the battery? What is
involved with doing this? Do I have to guess at the charge time, or is there
some way that I can calculate this? Can I use this power source as a trickle
charger? Any info would be helpful, since I will base my battery purchase on
this info. Thanks!
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James Gourgoutis
Mechanical Engineering O
University of Pittsburgh _ /__,
e-mail me at: (_) /(_)
or
Thanks! "Why am I so late? It took me
25 minutes to decide which bike
to ride!"
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Buy a charger that turns off when the battery is fully charged.

One of Harbor Freight's 400mA float chargers is fine and they often are on sale for under $5 https://www.harborfreight.com/automotive-motorcycle/battery/automatic-battery-float-charger-42292.html

But you're probably better off with a Li-Ion set up. Use 4 protected 18650 cells in series with a 14.4V Li-Ion charger. A little more expensive than SLA, but much more energy dense.