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You should be asking a sales person from the store. I am a customer just like you and didn’t have a good experience with the product.
The solar powered light you install them in will recharge them
They do not work in all solar lights.
Yes, you can. In fact, your lights will burn longer into the night if you do.
Batteries in storage, or in the original packaging waiting to be sold will slowly loose power. If they are fresh from the factory they will have a substantial charge in them, but it they have been hanging around the store waiting to be sold they will definitely need to be charged before being used. It's always a good idea to charge them before using them.
If your device used 3.2 volt batteries, it will not work with 1.2 volt batteries. It needs the correct voltage to operate. The 400mah rating isn't important, because it signifies how much current the battery will supply (how long it will operate). You could replace the 400's with 3.2 voltage and higher mah's (milliamphours).
The sun alone should charge the battery. I turned the lights off for a few days so they could charge.
Try wiggling the batteries to see if they are making contact with the terminals. Maybe the item you are using the batteries for are defective and therefor not charging the product fully? I purchased Hampton Bay solar lights, and the batteries that were included in the box (Brand name Paradise) only kept my new solar lights lit for 2 hours. After installing these Hampton Bay Ni-mh 1200 mAh batteries, my lights now stay on for 8+ hours. I purchased these batteries and they work great. Hope this helps.
Solar batteries are recharged in the units in which they are used such as solar pathway.lights.
yes ..1200 mah is double the power