I bought new rechargable batteries for my solar lights.will the sun charge them when i put them in?

the batteries in my solar lights were NI-CD but i bought new ones that are NIMH. will they work in there too and will the sun charge them after i put the new batteries in.they are rechargable and it says they need recharged before using them but i didn't know since they go in my solar lights. will the sun charge them?