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By breaking off a tab, you can get aftermarket or older Panasonic high-capacity batteries to work with the HC-V110 or HC-V201 camcorder -- a very useful upgrade, because its stock battery only lasts a short time, and this model can't run on AC power.
The older Panasonic batteries which need this modification are the VW-VBL090 (895 mAh), VW-VBK180 (1790 mAh), and VW-VBK360 (3580 mAh). And for reference, the new Panasonic batteries without the extra tab are the VW-VBY100 (970 mAh), VW-VBT190 (1940 mAh), and VW-VBT380 (3880 mAh).