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Discussion Starter · #1 ·
Somehow I left the key on on the 1500 and the AGM battery was so dead I could not jump start it,battery charger would not even show the least charge on the needle,left it on for 2 hrs.
Kinda figured I had killed it so I looked on you tube and there was a video on resurrection of dead AGM battery,
They guy connected a good AGM battery to the dead one and put the charger on the good battery so that’s what I did and left it for 3 hrs,the bike battery showed 12 volts so I put it back in the bike but it didn’t have the amps to start it but I jumped it and it did start,ya,
I rode it for 50 miles and came home and it did start on it own but only after letting off the starter button which is common for weak battery,
I put the charger on it for 4 hours and now it starts just like it did befor I left the key on,saved me 200$
 

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I have done that trick before
, it doesn't necessarily have to be an AGM as long as it's a good battery.
 

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Discussion Starter · #5 ·
It’s good to know,otherwise I would have bought a new battery,it acted like a dead cell
 

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Piaggio MP3, was 02 GL1800
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I too have done just that,
when I found my bike with the GPS left on, battery was at 4.x volts.
Natch, none of my chargers would accept it as a "chargeable battery"

jumped it with a spare bike battery, and left it for an hour, came back and put the Trickle Charger back on, and it has been working fine ever since.
 

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Discussion Starter · #7 ·
I don’t understand why it would do that but glad it did
 

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It's because most modern chargers require the battery to have a minimum voltage. This is for features like reverse polarity protection and auto sensing voltage, etc. Older chargers don't care, or you can use a bench power supply to bring the battery up to a level where the charger will accept it.
 

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‘91 gl1500
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I recently bought a battery that I thought was a good brand for my 1500. Did some research, and it had good reviews. Put the battery in, and it wasn’t enough to start the bike. I charged it up and it was fine, or so I thought. went three weeks without riding and it was down to almost 4 volts. To make a long story short, I contacted the seller, and after a few frustrating email later they sent me a new battery which I kept a tender on. Recently, I changed the radio which had no accessory wire, so when I shut it off, there is no draw. Had to put the tender on the Mrs. Accord for about a week, as it had been sitting for a while, and when I went to start the bike (didn’t ride for that week because Massachusetts decided she wanted to act like Texas and have near 100 degree weather for a couple weeks) the battery was completely dead, no voltage whatsoever. When I tried to charge it, my charger displayed “defective battery”. I had heard of the bringing the battery back to life method but bought another, same brand that I bought for my 1200 that was almost five years old when I sold it. I am now in a pissing duel with the other company as to wether they will take the three month batter back or not.
 

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Discussion Starter · #11 ·
Mine will set for a month and still fire right off without a tender.
 

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I have a charger that will attempt to charge a completely dead battery. https://www.amazon.com/NOCO-GENIUS10-Fully-Automatic-Temperature-Compensation/dp/B07W3QT226
That Force Mode is a nice feature. I'm surprised the lawyers let them put that in.

Reminds me of a customer that had a tractor that wouldn't start. He managed to charge the battery backwards. I swapped the wires and it fired right up. Ended up having to hook up that battery to a headlight for a week to drain it down then charged it back up with the right polarity and it actually worked fine. I was a bit surprised that it survived.
 
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Reminds me of a customer that had a tractor that wouldn't start. He managed to charge the battery backwards. I swapped the wires and it fired right up. Ended up having to hook up that battery to a headlight for a week to drain it down then charged it back up with the right polarity and it actually worked fine. I was a bit surprised that it survived.
I heard years ago that is a way to restore a bad battery.
 

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1993 GL1500 Aspy 1980 GL1100 STD
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Must've been an older tractor with an old style DC Generator. If it had an alternator the diode bridge won't let you put a charger on in reverse polarity, the diodes will present as a "Short" in that direction.
 
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