Milwaukee M12B4 4.0Ah Lithium-Ion Battery - Red

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Let's look at 9AH High Demand 18v batteries. These batteries are made up of 3 banks, 5 series LG HG2-18650 cells, which are rated at 3Ah, 4.2V 20A per cell. The 4.2 volt voltage is fully charged voltage, and drops rapidly to about 3.6 volts under load from where it slowly tapers off towards 2.5v as the battery discharges. So our battery is a 60A, 60A x 18V = 1080 watt battery. The energy of the battery is 9Ah x 18V = 162 watt hours. Don't believe me? Look at the bottom of your 9Ah battery. For Scotland, 2011 data is shown (update coming soon, the Scottish census was delayed by a year unlike the rest of the UK).

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What is 18650, 21700? These are cell sizes, 18650 means the cell is 18 mm in diameter and 65 mm long. 21700 means it's 21 mm in diameter and 70 mm long. The bigger the cell, the higher the Amps it can source, and typically the higher the Amp-Hour capacity of the cell is. A 2Ah 21700 cell can put out 30-40 Amps, while a 2Ah 18650 cell can put out 15-23 Amps. Milwaukee 1.5, XC(3.0), XC 4.0, XC 5.0, XC6.0 and HD 9.0 batteries use 18650 cells. Milwaukee HO 6.0, 8.0 and 12.0 use 21700 cells. For comparison, a HO 6.0 will absolutely destroy XC6.0 in terms of Watts is can provide, despite equal ENERGY (Watt-hours) and CAPACITY (Amp-hours), due to much higher CURRENT (Amps) 21700 cells can provide. Now let's compare 9.0 HD battery to a 6.0 High Output 21700 based battery. The 6.0 HO battery uses samsung 3.0 Ah, 43A cells, 2 banks of 5 cells in series. So a 6.0Ah can produce 86A x 18V = 1548 Watts. Here we see again that a 6Ah HO battery can produce more power than a 9Ah. Does it means 9Ah are useless? No! Again, use a battery best suited for your applications! A 9Ah will work well in the m18 grinder or a grass trimmer, but will underperform in the chainsaw. Remeber that the maximum power that tool will demand depends entirely on the motor and tool design. A 18v FUEL impact driver draws about 800 watts under heavy load, so slapping a 9Ah battery on it will not yield any higher performance, just higher runtime. Slapping a 1.5Ah on a chainsaw will not only get you about .3AH of useful capacity, the tool will stall very easily as the battery electronics will prevent you from overdrawing it and you will not get anywhere near the output power the tool needs.

Reverse mode allows the user to choose the belt orientation to manage the direction of sparks / chips.

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Battery voltage is "PRESSURE". Battery current (Amperes) is "FLOW RATE". The maximum amount of current (Amps) a battery can source is limited by it's chemical properties. Its typically INVERSELY proportional to the cell capacity (Amp-Hours). Yes, the higher the Amp-Hours, the lower the maximum Amps the battery can supply. NB: I do not work for Milwaukee, I am not sponsored by them or anyone else, and I have no conflict of interest as I do not benefit from sales of Milwaukee tools, neither is this subreddit. speed modes and variable speed trigger provide maximum control from taking down welds to precise work with inox, aluminium and wood.