Unlock expanded power for 40V tools This 40V series adapter allows you to power 40V tools with your existing 18V lithium-ion batteries, doubling efficiency and saving money. Simply connect two identical 18V batteries to the adapter's dual ports in series to provide a stable 40V output. It's ideal for tools like lawn mowers, blowers, hedge trimmers, and leaf vacuums/shredders. Important: Use only batteries with the same current rating and charge level. Mixing capacities may cause battery imbalance or damage. Charging Warning: Never charge batteries while the adapter is connected. Compatibility and Durability Note: This adapter is intended for powering tools only.