![]() That meant cutting through the rebar as quickly as possible without bogging down the tool in the process. We chose to dial in the sweet spot between cutting speed and battery efficiency. There are several ways to tackle this test, but we wanted to mimic what users in the field would most likely experience. We wanted to see how many cuts we could make through rebar with a fully charged battery. We took the DeWalt FlexVolt angle grinder and Milwaukee M18 Fuel angle grinder and installed identical Diablo 5-inch cutting wheels. To compare the Milwaukee High Output vs DeWalt FlexVolt battery in a real-world scenario, we grabbed a couple of packs and started testing! Milwaukee High Output vs DeWalt FlexVolt – Testing the Packs So is one battery better than the other in this case? The reality is you can only go so far before putting the cells in danger, usually due to heat. Or using the battery in series mode at 20V Max…ĭeWalt FlexVolt 12.0 Ah Power = 12.0 Ah x 18V (nominal) = 216 Wh Milwaukee HD12.0 Pack Power = 12.0 Ah x 18V = 216 WhĭeWalt FlexVolt 12.0 Ah Power = 4.0 Ah x 54V (nominal) = 216 Wh So let’s plug in some actual numbers for these batteries: In theory, if you give two tools identical tasks it should require the same amount of work from both regardless of the volt/amp configuration. The Milwaukee HD vs DeWalt FlexVolt batteries come pretty evenly matched. That’s especially true given the limitations of a battery pack’s total capacity (measured in watt-hours (Wh). In this way, the higher voltage does not necessarily equate to a higher power tool. To get the same power you can either increase current…or increase voltage. Increasing either the voltage or the current flow will increase your available power. We’re not going to get into all of that right now, but the bottom line is that you have to have both to produce power. There’s a complex debate between voltage and amp hours that involves a lot of physics and chemistry geek speak. Milwaukee High Output vs DeWalt FlexVolt Voltage vs Amp Hours However, Milwaukee and DeWalt come evenly matched when it comes to batteries you’re likely to stick on a handheld tool like an impact driver, drill, or angle grinder. So when we look at the battery capacity in terms of watt-hours (total power availability), we see that DeWalt FlexVolt currently has a clear advantage over Milwaukee High Output. You can find the total Watt-hours written on the underside of nearly any battery pack. A simple multiplication problem of nominal volts multiplied by the amp hours yields a total capacity of 216 watt-hours packed into 15 lithium-ion cells. Going by the above chart, the Milwaukee High Output 12Ah M18 RedLithium battery extends capacity while staying on its original 18V platform. While DeWalt also has a 5Ah (20V/15Ah) FlexVolt battery, the size makes it impractical for many handheld power tools. Milwaukee High Output vs DeWalt FlexVolt Battery Capacityįor an easy visual comparison, we grabbed a Milwaukee M18 RedLithium High Output HD12.0 battery pack and a DeWalt FlexVolt 4.0Ah (20V/12Ah) battery. Keep in mind we’re only comparing 60V FlexVolt-specific packs on the DeWalt side: Milwaukee M18 Here’s how the Milwaukee High Output and DeWalt FlexVolt battery packs match up. The packs don’t change in terms of capacity-just how we refer to them when testing apples-to-apples: When using it with a 60V FlexVolt tool, the lower rating takes over. ![]() When using a DeWalt FlexVolt battery with a 20V tool, you have a higher Ah rating. Keep in mind that with DeWalt Flexvolt, you have two ratings.
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