What's the difference between batteries (and what does "AH" measure)?

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I bought a lawnmower (LM2100SP) at home depot. Someone at the store suggested I should buy an extra battery. Makes sense. But when I got everything home, I noticed that the battery that was included with the mower said it's 7.5AH. The spare they were selling at Home Despot said it's 2.0AH. 

First of all, what type of unit is "AH"?
Second, is the 2.0 AH battery sufficient to run the mower? Will it be underpowered? Will it run down much sooner than the 7.5 AH?

I am suspecting that I should return the 2.0AH battery and buy one with more (whatever AH measures) online?
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Marc Whinston

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Posted 2 years ago

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szwoopp, Champion

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Ah is amp hours. Bigger number is longer run time.

The 2.0 will run the mower but is really not the proper battery. Probably only run the mower for 15 minutes tops. The 7.5 May get you an hour or more depending on conditions.

See how much you can get done whit the 7.5. Many people find that is more than enough to mow their lawn.

If you find you need more then a kit with another tool is really the best bargain. Or the batteries are currently on sale at hd or granger

Good mowing and let us know how it works out.
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Marc Whinston

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Thank you.
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Marc Whinston

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Actually, if I may ask another related question...are all the EGO batteries compatible with the same appliances and charger? If I want to order online, do I have to worry about buying something that won't fit in my charger or mower?
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Oregon Mike, Champion

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Yeah, all EGO batteries will fit in all EGO tools and chargers. However, as Erik says, runtime could be diminished with lower Ah batteries in larger tools. By the same token, a larger Ah battery could make one of the handheld tools (blower, string trimmer, etc) feel a bit heavy. 
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They’re all compatible but the smaller batteries won’t give you much run time on power hungry stuff like say the backpack blower or mower.
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The higher the AH is, the more stress it can take during operation. That being said, I would not recommend anything less than the 5 AH battery.