Why don't chargers have an optional storage mode that keeps batteries between 30%-50% charge state?

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Given that batteries are insanely expensive, and that fully charging or discharging while in long term storage, like winter - why can't there be a two position switch on the charger? 1. A normal "charge mode", 2. A "storage mode" that maintains a charge state between 30% - 50% to optimize battery life as the owner's manual states. We only recently got a fuel gauge, something that we've griped about forever. I recognize there would need to be changes to the charger besides just adding a switch, lol. 
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Frank Woodbery

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Posted 5 months ago

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TK

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My understanding is that the battery goes to sleep after 30 days to the 30% level...

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Prairiedog

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You don't need a switch. The battery automatically puts itself in storage mode after 30 days of idleness. One reason for the expense. It has a more sophisticated power management system than competitors.
(Edited)
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Frank Woodbery

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Yep I understand that, but over time the battery will fully discharge on it's own. Would it not be a good idea to just keep it in the sweet spot for 6 or 7 months of disuse? 
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Prairiedog

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It shouldn't? Ours sit for months sometimes, and are still ready to go.
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szwoopp, Champion

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Still at 30% after 6 months of sitting
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Frank Woodbery

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That is a surprise. A Li-ion battery that sits unused for 6 months at a constant 30% charge without any additional charging? I thought even the very best low self-discharge batteries lose some charge over time. 
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Oregon Mike, Champion

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Looks like an EGO battery would have to sit around for a really long time, 10 years or more, before it is too discharged to use. Link to a UK based PDF.
https://egopowerplus.co.uk/sites/default/files/2018-10/41891-EGO-Battery-FAQs_Interactive_AW_FINAL-c...

Picture from a page in the pdf.



I imagine these numbers are the same for any US sold batteries too.
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Frank Woodbery

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That is impressive! A lot of good info in that PDF, thanks.
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Prairiedog

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I'm confused by your comment "even the very best..." Egos are the best, and are setting the standard for Li batts.
(Edited)
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szwoopp, Champion

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Nice find Mike !
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Blue Angel, Champion

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Wow, what a document!!!!!!!!  I think this needs to be PINNED to the top of this forum!
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Blue Angel, Champion

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Wow, what a document!!!!!!!!  I think this needs to be PINNED to the top of this forum!
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szwoopp, Champion

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So exciting Blue posted with both hands
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Blue Angel, Champion

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So excited I couldn't stop clicking the mouse!  :-)