Garden tools lithium battery prices are relatively high, power is weak, the battery unsafe, but the advantage is convenient for outdoor use, clean and green, low risk of electrical shock, while the price battery safety and other issues, but also with the development of battery technology and is being gradually resolved. With battery prices fall further, the battery specific energy than the power increases, the popularity of the development of permanent magnet brushless motor position sensors, lithium garden tools will gradually replace the mains and engine garden tools in the domestic field.