Generally, more is better but don't go over 10% of the RC (reserve capacity) or 25% of the AH (amp hour capacity) of the battery. Ten or 12 amps is fine for most batteries. You'll get a longer service live from your trolling battery if you recharge it as soon and as quickly as you can. It'll take a 2 or 4 amp charger a long long time.
Whatever you end up with, make sure it automatically switches to "float charge" or "float mode" (*NOT* the same as "trickle charge") when the batteries are fully charged.
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"The metric system never really caught on in the states. Unless you count the increasing popularity of the nine millimeter bullet." -- d. barry
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