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Learned something about lithium batteries today

Started by Dirty Duc, March 18, 2018, 05:10:06 PM

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Dirty Duc

March 18, 2018, 05:10:06 PM
So I killed my lithium battery a few months back. Left the key on.

Battery tender that claimed to have recovery capability couldn't recharge it.

Today, I recalled that the claim was something like "a much higher initial charge rate, then back to a low charge rate."

So I took my big battery charger and set it for 200A start, and started the bike with it. Lithium battery appears to have been resuscitated.

greenohawk69

#1
March 18, 2018, 05:19:04 PM
Good to hear.
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ducpainter

#2
March 18, 2018, 05:20:01 PM
No reason to baby it. [thumbsup]

Deep cycle batteries are similar. They need to be charged at a higher rate than tenders provide.
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Dirty Duc

#3
March 18, 2018, 05:28:02 PM
What's weird is it's not like I actually charged it. More like I defibrillated the internal control circuit...

I'll keep that in mind when the circuit fails and the battery burns my bike to the ground. :)

caboteria

#5
April 28, 2018, 04:32:30 PM
Similar experience here - battery tender wouldn't charge the lithium battery in my track bike, but I attached my old Sears charger, put in in "activate" mode, left it on for an hour (anxiously checking it every few minutes) and now the battery works great.

koko64

#6
April 29, 2018, 02:47:57 PM Last Edit: April 29, 2018, 02:50:07 PM by koko64
Quote from: Dirty Duc on March 18, 2018, 05:28:02 PM
What's weird is it's not like I actually charged it. More like I defibrillated the internal control circuit...

Was it an EarthX? They can be defibbed in a similar manner to switch them back on after overcharging or overdischarging has triggered the inbuilt protective circuit.

To defib a Shorai I use inertia charging with my car charger and a voltmeter, never exceeding 15V.
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