Thanks, all. I was using it while plugged in, perhaps what I observed was the charger couldn't keep up with consumption while downloading, reading and (cough) playing games. My Amaze can keep up, even charge a little, with a charger while playing video or video chatting. I thought a 2.1mA charger would do better (granted, it's the device's charge circuit that determines charge rate, current).
Cable is a better one than stock, a herky AmazonBasics 4' one. I installed Battery Monitor Widget Pro, which is indispensable on the Amaze, though, so after a few days' use I'll have a better picture. Will repost back.....
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