Sounds like your charger will work out the amp itself. A lot of the newer chargers are smart chargers 
As in you tell the charger what battery you are charging and it will set itself up to charge it safely
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@speatuk these guys have the patience of Saints mate and there is no such thing as a stupid question if you don’t know about something. The only stupid thing would be to just do it without asking
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I do my 450 at 1a. They will be fine.
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When I’m in a hurry I do mine at 2A 
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It’s not that new probably 5 years old. But it does automatically set the amp rating for you.
You set the “s” value, the “mah” value and it automatically sets this to 0.5a (500mah) I do have the ability to alter this to whatever I want
I got this charger to charge the batteries for the 3DR Solo and didn’t need the balance part. So I put those bits away “safely” 
Took a full morning of routing to find them. Then I only found 2.
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What benefit does this have?
Scratch that I see it speeds the charge up.
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A faster charge time 
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Brushing your teeth or wiping your butt – you have to give one up. Which one would it be and why? 
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Thats a thing? 
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OK I take it back, there are some stupid questions
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