Product details:

The JVC BN-VG121 Data Battery (3.6V, 3750mAh) is designed as a spare or replacement battery for HD and Standard Everio camcorders. This battery provides remaining battery power on your Everio's LCD screen so you're never caught off guard by a loss of power. The BN-VG121 can power hard drive HD Everio models for up to 2 hours and 5 minutes, and other HD Everio models up to 2 hours and 40 minutes. Standard Everio hard drive models can be powered up to 3 hours and 50 minutes, while Memory models can be powered by the Data Battery up to 4 hours and 40 minutes.