Black Friday 12.4 hours of mixed use (4850 + DBMD4 DSP) Battery, 45 Minutes when used in standard mode on hard floor, with floor brush switched off Battery, A single charge lasts up to 8 weeks, based on half an hour of reading per day with wireless off and the light setting at 13. Battery life may vary depending on use. Audible audiobook streaming over Bluetooth will reduce battery life. Battery