Masione Replacement DC31 Battery 22.2V 2.0Ah for Dyson DC31 DC34 DC35 Brand New | Li-ion | 22.2 Volts | 2000 mAh | Black Integrated microchip prevents overcharging & lengthens battery life Batteries made with high quality LG 18650 cells No memory effect, you can charge the battery anywhere anytime 1 year warranty , 30 Days Money back warranty