4 ms·And battery safety.by imhoguy 6y agoAnd battery safety.jbay808 6y agoThey're almost certainly using LiFePO4 chemistry, which tends to be pretty good for safety.topspin 6y agoLiFePO4 gives up some energy density. Where have you learned what is typically used for batteries in these? LiFePO4 certainly is a safe choice.