Battery Maintenance

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Searching the past comments here, I found this site, which is to a truly comprehensive source of battery info:
https://batteryuniversity.com/index.php/learn/article/how_to_prolong_lithium_based_batteries

From this site and comments by EGO official reps and other users, I come to these conclusions for what to do for a long lived battery.  Note these are not all EGO recommendations but rather some are general lithium ion battery suggestions.

1.  Don't run your battery all the way down.  Hard to know when to stop since there is only green and then amber/red.  I guess that means stop now.

2.  After use, for storage until next time, recharge the battery but only to 30-50%.  Unfortunately, the only way to do that is to use the rapid charger, which has charge progress lights, and stop when the 50% charge light comes on, since the standard slow charger binary in its indicators: charging or charged.  See 3. below.

3.  Don't use a rapid charger.  But only the fast charger will tell you when it is 50% charged.

4.  Store at temperatures below 80 degrees and in low humidity.  I'm in Houston, Texas.  Those conditions don't exist here between May and September.  That means I must charge my three batteries (to 50%) and then bring them into the house until next week.  Then on the evening before yard work, take the batteries out and finish charging them, preferably on the slow charger, but I have only two slow chargers.

Yes, this is a lot of trouble--especially getting batteries to 50% charged for storage.  Given the high price of replacement batteries, though, maybe it's worth it?
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William

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Posted 4 months ago

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szwoopp, Champion

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That is pretty mush the system/techniques I try to use most of the time.


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Frank Woodbery

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My thoughts exactly. I had previously mentioned here that I wish the EGO chargers had a switch that would also put batteries into "storage mode" - keeping charge state constantly between 30-50% to optimize battery life. Never to 100%. The response from the community was that since batteries automatically self discharge to a 30% charge after a certain period of time and virtually stay at a constant 30% there is no need for that feature on the charger. 
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William E Hanson

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I have 5 EGO batteries from 2.5 through 7.5 Ah and haven't followed this ridiculous regiment; I simply use them almost daily year round, run them until I notice the red light, fully charge on rapid chargers and place them on my battery rack in the garage and use them on rotation. The garage isn't climate controlled, but well insulated to remain mid 40s during the coldest periods. They're all performing as advertised; no complaints. I take care of them, but certainly don't baby them. The key is use them regularly.
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szwoopp, Champion

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What would babying batteries encompass and why would one want to avoid it ?
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William E Hanson

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These are heavy-duty tools and used as tools; not careless or abusive. just not "babying" them. If it breaks out of warranty, just buy another. Just my methodology with tools.
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Oregon Mike, Champion

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Fortunately new EGO batteries are coming out with fuel gauges. But, that red light is a good indicator of when to stop and recharge the battery.
However, I tend to trust EGO's engineers have made some good decisions to help get max life out of these batteries. The active cooling system and power management in the batteries keeps them pretty well within safe parameters for Li batteries, IMO. Since the storage mode is pretty much automatic a switch really isn't needed to force them into storage mode. 30% charge is just fine for these batteries.
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Frank Woodbery

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I don't think anyone here babies batteries, they just don't want to fork over $350 for a new 7.5 Ah battery if they don't have to - by taking some simple commonsense precautions.  It's not like somebody that would actually wax their mower. Err, somebody does do that - excuse me.