The lithium battery is universally applicable to single-head/double-head brushes, roller brushes and robots, with the following core parameters: nominal voltage 24V, nominal capacity 26AH, ternary lithium battery (6 series and 10 parallel), AC internal resistance ≤100mΩ, charging/discharging temperature -20~50℃, charging cut-off voltage ≤25.2V, discharge current ≤15A, discharge cut-off voltage ≥16.8V, weight 3.5kg, shell size 16924CM (24016090 mm for cell). The discharge capacity is 624Wh (24A*26V).