Battery Type –Upgraded 6000 mAh real capacity, 22.2 Volt, Li-ion Battery Replacement Battery for Dyson DC31 Type B, NOT fit DC31 Type-A. If you need DC31 Type-A, Please search ASIN: B0875GZHMJ. Perfectly Compatible — 100% compatible with original Type B DC31 DC34 DC35 DC44 DC45 DC56 DC57 vacuum (Only Fit for Type B). Please check the connector of your original battery when purchased. It’s type-B, NOT type-A. High Capacity — Upgrade 6.0Ah capacity can provide more power and longer runtime on a single full charge compared with 3.0Ah 4.0Ah. No memory effect. Can be charged or discharged as needed without loss of capacity. Multiple Protection & Safety System — Be multi-certified, tested and validated by the manufacturer to match the specifications of OEM products. Built-in High-quality Cells which can protect against overcharge, over-discharge, over-current, over-voltage, and short circuit. Warm Note — Just after using the battery, the battery will heat up. This is a normal phenomenon. Please do not charge it immediately, otherwise, it will affect the battery life. Filters should be washed every month and replaced every half year. br br