High amp charging a new (or any battery) is a sure way to kill it quick !
You right to say that a step charger is best. About 1-2 amps is best. Over 3amp will do damage.
10% of the ampere-hour rating of your battery is the max you ever want to go.
A trickle charger will do exactly the same job, just take longer.
The "tender" is a fine charger.
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Did some trips.
Rode some bikes.
Fix them for a living.
Can't say anymore.
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