Learned something about lithium batteries today

[Dirty Duc]

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]

Good to hear.

[ducpainter]

No reason to baby it.

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

[Dirty Duc]

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.

[koko64]

http://www.ducatimonsterforum.org/index.php?topic=75839.0

[caboteria]

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]

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.