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What's the difference between XX Volt and XX Volt MAX on rechargeable lithium ion batteries?

Home Improvement Asked by Ghostship on October 2, 2021

I was looking at battery power tools and their different battery voltages. Some of the voltages are listed twice, with and without "max". An example for mowers is "40-volt" and "40-volt max". What’s the difference between the voltages with "max" and without "max"?

battery voltages

One Answer

There is one brand of "20-volt Max" tools that reasonably clearly state on their packaging something to the effect of:

Battery provides 20 volt maximum starting power. Provides 18-volts in use.

As a matter of fact, they'll sell you a simple physical adapter (and some wiring between the contacts) that will allow you to use the "20-volt max" batteries on their older 18-volt line of tools.

TL;DR:

"Max" is 98.475% marketing because "Max" sounds, well, like more than "not-max". (And 99.238% of all statistics on the internet are made up on the spot.)

Answered by FreeMan on October 2, 2021

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