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The original idea behind the term trickle charger was to create a charger that kept up with the natural self-discharge rate of lead acid batteries. The problem is every brand, style and size of lead acid based batteries incur different rates of discharge. So the one size fits all idea was not the best thought out plan. See What is a Smart Charger?
A smart charger, sometimes called a float charger is a microprocessor controlled charger that safely reads and responds to a battery to perform a number of sophisticated charging functions, well beyond the capability of inexpensive trickle chargers. See What is a Trickle Charger?
This would not be my first choice for a marine deep cycle battery charger. The amperage output is to low and will cause unnecessary stress and potentially damage to both the battery and the charger. I would also consider a waterproof / water resistant charger.
If your battery is between 35 and 75A you could use a 4 to 6A charger, consider the:
If your battery is 75 to 130A you could use a 6 - 10A charger, consider the:
If your battery is 100 to 250A you could use a 10- 15A charger, consider the: