4 ms·I have the forerunner 245 music. It lasts days (at the worst) and can sync offline spotify playlistsby 121789 5y agoI have the forerunner 245 music. It lasts days (at the worst) and can sync offline spotify playliststra3 5y agoThanks! Does it include body battery too? Do you find it useful?121789 5y agoYes it does. I found it pretty enlightening. It tracks almost perfectly with how I feel in the morning and helped me get a sense of how alcohol in particular affected me.