A 5 amp charger implies that the maximum charge rate is 5 amps. So if you have a battery with less than or equal to 5 Ah, you can charge at 1C. but if you have batteries with capacities higher than 5 Ah, you will only be able to charge at a maximum rate of 5 amps which will be less than 1C and take longer.
Yes, I charge 11600mah 3s2p LiPo on my emax 5a charger. Sure, it will take slightly longer to charge by having a limited 5a charger, but it will charge just fine.
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A 5 amp charger implies that the maximum charge rate is 5 amps. So if you have a battery with less than or equal to 5 Ah, you can charge at 1C. but if you have batteries with capacities higher than 5 Ah, you will only be able to charge at a maximum rate of 5 amps which will be less than 1C and take longer.