Cannot charge batteries and use USB at the same time. You can't even keep the USB cable plugged into the charger and use the charger all the time. If it had been stated more clearly in the product description I would not have made the purchase which is probably why they hid that information in the description. Additionally, the charging lights will be solid green instead of changing from orange to green when fully charged. That's not a problem in itself, but it does show the lack of detail in this charger's design. I expected more from Panasonic. You can get an equivalent working charger for less.
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