"John H." wrote in message
...
I'm keeping the battery from the new boat in the garage so I can put a
charger on it every so often during the winter. The battery is a Nautilus
Gold Marine Deep Cycle, NG-27.

Yesterday I attempted to charge the battery with an automatic charger set
at 2 amps, 12 volt, deep cycle setting. The little green light began
blinking as though all was going well.

About 24 hours later, I noticed the little red light had come on,
indicating I should check the battery. I disconnected everything.

I'm thinking that 2 amps is not enough to charge the battery, and that I
should try it at 10 amps. But, I don't want to damage a brand new, never
used battery!

Ideas anyone?
My understanding is that these cheap smart chargers merely change the
set/reset voltages depending on your switch settings and battery voltage.
Your battery may not be able to charge to level that satisfys the charger.
Try a different charger or do a few charge/discharge cycles if the battery
is brand new. If the battery has gone flat, you may have to desulfate it.
There is a lot of information about battery charging on the Surette website
and other sites.