Since the core Charge experience is nearly identical to Flip’s—a tube with two 40-millimeter speakers, a 10-watt amplifier, a Bluetooth wireless chip, and a rechargeable battery—one might imagine that there wasn’t much room for differences between the models, but that’s not the case. Charge is nearly an inch longer than Flip, measuring around 6.9” from end to end, and thicker with a nearly uniform 2.7” diameter…
