If not careful when attempting to remove the battery in your 700 series, The release knob can snap off, so do not force it, or drop the battery as dropping the battery can shift the composite casing which can also break the knob. It is important to push upwards on the battery to take the weight off of the latch. If your release knob is broken, You can order a replacement knob from Ride1UP. Contact support@ride1up.com

Please reference this video on how to remove the battery & replace the broken release knob: