The battery life of the first generation of iPod Mini was about 8 hours, similar to the third generation iPod that was available when the Mini was released, which some criticised for its short duration. Apple addressed this problem in the second generation models, which had a nominal battery life of about 18 hours. However, the second generation iPod Minis no longer came with a FireWire cable or an AC power adapter, which were left out to reduce the selling prices of the new iPod Minis. iPod Mini batteries, like many Lithium Ion batteries, run down to 80% capacity after 400 full charge cycles. A proprietary dock connector was provided on the bottom of the device for a connection to a computer's USB or FireWire port. The unit's battery could be charged during connection. Along the top it had a hold switch, a headphone jack, and a remote connector for accessories.