This is a conveniently packaged reverse-polarity CR2032 battery with wire leads and connector already attached (select from two available connectors.) These are lithium alkaline (non-rechargeable). They are usually used for remote controls, computer motherboards (CMOS) for PCs, laptops, notebooks, etc. They are also great for powering brush robot, bristle bots and toothbrush bots projects. Each battery is 3V and 210mAh.
Please note that batteries are non-returnable.
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