The particular terms of the two battery powered leaf blower forms indicate it already. The central difference between 18/20V Max and 40V Max appliances is the battery (respectively the battery voltage). Popular battery leaf blowers are by now operated with lithium batteries – usually either with 18V/20 Max or 40V Max volts. By comparison, the battery of a cordless shaver has 1.2 or 2.4 V; drills often have 10.8 or 14.4 V.
The performance of electronical devices is measured in watts. The unit „watt“ is so to speak the counterpart of the unit „horsepower“ at classical petrol engines. Take a car, for example. The more horsepower it has, the faster it goes. It’s very similar in the case of battery powered leaf blowers. The more watts a battery leaf blower has, the higher is its maximum air speed. Generally, 40V Max appliances have a higher average power in watts than 18/20V Max devices (hence they can achieve a better performance).
Size and weight
If high performance shall be achieved, a robust overall solution is needed. Take the car again. On the one hand, a Ford Expenditure is a brawny car with an extremly powerful engine. On the other, a Ford Focus has a much smaller engine and is moreover „slenderly“ designed. Logically, a higher overall performance can be achieved with the Expenditure than with the Focus.
For battery powered leaf blowers it’s pretty much the same. You generally can achieve a higher performance with a 40V Max blower than with a 18/20V Max device. However 40V Max devices are also heavier and less handy. For an illustration, you just need to compare the technical details of the battery leaf blowers of Black and Decker or Dewalt on Amazon. The two manufacturers offer both – a leaf blower with 18/20V Max as well as a 40V Max.
The relevant measure in context of battery technologies is the battery running time or battery life. The battery running time is depedent of the amount of energy that can be stored in a battery. The stored energy is measured in watt hours. It can be calculated by multiplying the battery voltage wih the battery capacity (in ampere hours). The following example illustrates it: A 18/20V and 40V battery feature a capacity of 4.0 ampere hours each. Hence the batteries can store energy up to 80 watt hours (18/20V Max battery) respectively 160 watt hours (40V Max battery). That means the higher the battery voltage, the more energy can be stored in the battery (under the assumption both batteries have the same capacity as in the example above).
The actual battery life in hours can then be calculated by dividing the amount of storable energy / consumed energy (watt hours / watts). Although 40V Max battery operated blowers typically consume more energy than 18 volt appliances, they usually still reach longer running times than 18/20V Max batteries.
The larger the capacity of a battery, the longer it logically takes to fully recharge the battery. The charging current is given in amperes. 40V chargers usually have higher charging currents, than 20V chargers. Nevertheless, it normally takes longer to fully recharge a 40V Max battery than a 18/20V Max battery.
For sure, a high performance and long battery life comes at a price. Therefore, a 40V Max battery blower solution usually costs much more than a 18/20V Max solution. Firstly, the 40V device is more expensive due to the more powerful engine. Secondly, there are higher acquisition costs as 40V batteries have a bigger energy storage than 18V appliances (which logically leads to higher production costs).
On the one hand, 40X Max battery operated leaf blowers have more power than 18/20V Max appliances and the 40V Max batteries usually last longer. On the other hand, 18/20V Max battery leaf blowers are lighter and handier as well as cheaper to buy. In our opinion, 40V Max appliances are ideal for users who often use the blower and for longer periods of time. The cheaper 18/20V Max devices are especially a good investment, if the battery operated leaf blower is used seasonally or rarly.
Table 1: Comparison of the best rated 40V- and 20V cordless blower
|Oregon Cordless Blower BL300 40V||Dewalt Cordless Blower 20V Max|
|Max air speed||132 mph||90 mph|
|Max air volume||507 cfm||400 cfm|
|Weight||6.2 lbs||7.1 lbs|
|Sound pressure level||60.8 dba||65 dba|
|Capacity (in Ah)||B500S: 1.25 Ah|
B400E: 2.4 Ah
B600E: 4.0 Ah
|DCB200: 3.0 Ah|
DCB201: 1.5 Ah
DCB204: 4.0 Ah
DCB205: 5.0 Ah
|Electricity use (in Wh)||B500S: 45 Wh|
B400E: 86 Wh
B600E: 144 Wh
|DCB200: 54 Wh|
DCB201: 27 Wh
DCB204: 72 Wh
DCB205: 90 Wh
|Charger||C600 Battery Charger|
C750 Rapid Battery Charger
|DCB102BP 20V Charging Station|
|Charging time||With C600: |
B500S: 60 min
B400E: 120 min
B600E: 240 min
B500S: 30 min
B400E: 30 min
B600E: 60 min
|DCB200: 30 min|
DCB201: 60 min
DCB204: 75 min
DCB205: 90 min