12.0V, 2000mAh, Ni-MH Battery fits Palco Laboratories, 400, 500 Pulse Oximeter, 24WhBattery Fits Models: 400, 500 Pulse Oximeter Battery Part Numbers: 5781 This battery should be the same or greater capacity than the original battery. Our equivalent battery is made with premium cells and is rated as shown in the specifications on the product page. Battery selection can be a complicated process. Leave the selection to the experts if you are not sure. We can be contacted easily by live chat or by email. We will respond to your query
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