Four and five string packs (10Ah and 12.5Ah)

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They may be big, they may be heavy, they may be expensive, but they'd be useful.  I do not know if they would fit in the mower or snowblower, it may be tricky to keep those cells ventilated, but if it can be done, I'd buy packs like that.  Then of course there is the before-mentioned matter of backpack batteries in the United States.  I want them much mo' bigger.
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Posted 3 years ago

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Amber F., Official EGO Rep

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Official Response
We’ll let the team know! :-) 
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Just take the snow blower electronics. And bay, and attach it to a backpack. Peakpower backpack. Cost to market is quick. Uses existing batteries and the best part, less battery wear.

Im going to build one some day.

One could even make cables that have voltage reducers to power other brand power tools... talk about a huge battery sale market domination
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Yeah, that reminds me of my electric Husqvarna 580BTS project, where I transform a Husqvarna 580BTS gas backpack blower into an electric one just for the hell of it.  It would probably be easier to keep the weight down by making a high-powered handheld blower powered by a backpack battery.  I still want EGO to match 908 CFM at 206 mph some day.
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George C. Lutch

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Why not just keep the battery dimensions the same except for the length then just sell covers to account for the added length.

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I think it would make more sense to string together 3 rows of larger 21700 4.0Ah cells for a 12.0Ah battery.  In my opinion, the more cells, the more chance of battery failure.  If one cells fails, the whole battery will eventually only partially charge or stop charging entirely.
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Also going over 3 parallel circuits is not at all recommended with lithium. Too much chance for cross charging or something like that. well, so I have read.