We don’t know what lithium ion battery cells are used in the 10Ah or 9Ah batteries right now, so let’s look at two off-the-shelf batteries. There’s a common trope where a smaller guy is fighting a larger guy, and all they have to do is wait for the larger guy to tire themselves out. Battery cooling and heat dissipation come into play here as well. Generally, and I say this in case there are ever exceptions, when considering cylindrical batteries of comparable size and technologies, and within the same or similar product families, higher capacity batteries with higher energy densities will have lower constant discharge current ratings. The 10Ah battery is engineered with 5.0Ah cells, while the 9Ah battery is engineered with 3.0Ah cells. What we were talking about just now involves imagining that both batteries were engineered with the same Li-ion cells, but they’re not. And so, the real-world differences likely come down to proportional differences in runtime.īut wait, there’s more to consider. The tricky part here is 20V Max tools are designed to be powered by 5S2P and even 5S1P (compact 5-cell) batteries. When composed of identically-capable members, a team of 3 can outperform a team of 2. But with heavier work, you’ll see an increasing performance gap between the two groups as you approach or surpass the limit of what a group of 2 such people can do. When faced with medium-duty work, you might start to see some differences. When faced with light work, the two groups will perform their tasks with comparable effectiveness. Imagine that there are 5 people with identical strength and endurance, and they are split into two groups of 2 and 3. With all things being equal, a 5S3P battery can deliver more power than a 5S2P battery. Instead of the two batteries being engineered with different Li-ion cells, let’s say that they both featured the same Li-ion cells, either 3.0Ah or 5.0Ah, it doesn’t matter. We’re also speaking about the FlexVolt battery in parallel 20V Max-compatible mode exclusively.Īlright, so we have the 10Ah battery with its 5S2P configuration of 5.0Ah cells, and the 9Ah battery with its 5S3P configuration of 3.0Ah cells. For the sake of this discussion there exists a hypothetical Dewalt 20V Max tool that can draw increasingly high levels of current from any connected battery. Let’s remove that consideration for a moment. After all, the same tools are also designed to be powered by Dewalt’s full spectrum of battery sizes, including their 1.5Ah to 5.0Ah batteries (and FlexVolt 6Ah) engineered with 18650 Li-ion cells. In other words, the 10Ah battery and FlexVolt 9Ah battery should in theory deliver comparable performance but with just a proportional difference in runtime. Generally, Dewalt’s 20V Max cordless power tools are designed around the power delivery capabilities of 20V Max batteries. 5×3 = the same 15 cells as in serial mode. In parallel mode for use with a 20V Max cordless power tool, the same 15 cells are switched to a 5S3P configuration. The charge capacity is not additive in a 1P configuration, and so it would be whatever the individual cells are rated at, or 3.0Ah for this configuration. When connected to a FlexVolt 60V Max cordless power tool, those 15 Li-ion cells are switched to a 15S1P configuration, where you have 4.0V x 15 = 60V Max. Excluding the thumb, this would be an 8S1P configuration.ĭewalt’s 9Ah battery, also presumably built with 21700-sized Li-ion cells, has 15 cells. Your knuckles should line up in a single-file row. Now, make two fists and stack them, one on top of the other. You have 2 groupings of 5 fingers in a 5S2P configuration. If you need help visualizing this, take your two hands and put them together, with open palms facing and left and right fingers touching each other. With two rows of cells arranged in parallel, the charge capacity adds up, so you have 5.0Ah x 2 = 10.0Ah. The cells are arranged in a 5S2P configuration, which means that you have 2 rows of 5 battery cells arranged in series.Įach battery cell has a 3.6V nominal voltage, or 4.0V Max voltage. This is a 10-cell battery built with Li-ion cells presumably rated at 5.0Ah each. I have not yet tested or even handled the new 10Ah battery, but it’s fair to assume that it’s engineered with 21700-sized Li-ion cells. 9Ah, how do they compare? Dewalt 20V Max 10Ah Battery (DCB210) With these two batteries similarly spec’ed at 10Ah vs.
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