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you mean a VX-1? just charge it for 8 hours. in that time period, you will not overcharge (the charger is not terribly fast which is good in this case) and you will be sure to reach full charge in that time.then....i use mine for about 3-4 days of fishing, then recharge. depending on how long i fish i could probably get 1 or 2 more outings on the charge, but i would hate for it to die on the water.do it overnight, then go use it!
Plug charger in, lights up green. Connect to battery, charger changes to red. When charger is green again, battery is fully charged.Ooops... you said Marcum, not Vexilar.