is my battery tender killing batterys? - TwoWheelForum: Motorcycle and Sportbike forums
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post #1 of 5 (permalink) Old 08-05-2008, 05:15 AM Thread Starter
Join Date: Nov 2006
Posts: 325
is my battery tender killing batterys?

I stored my sv650 over winter and some one disconnected the battery tender so naturally it was dead. I brought it back to life with a charger. I road the bike for a few days and then parked it for a week or so (this time connected to the tender). I pull the bike out and she fires right away. I ride it that day and park it for less than a week (without the tender) I get the bike back out and its dead...

I figure the battery must have died from being so long without a charge.

My friend left me his sv650 to work on for a while. It had been sitting for about a month. I turned the key, the battery was charged enough to light the dash but not enough to turn the bike over. I charged the battery up and put it in my sv. If I forgot to put the tender on it for more than a week of sitting the battery is dead when I come out.
I thought that there must be something wrong with my bike, a drain in the system ect...

I just finished working on my friends bike and put his battery back in it. I road it last night for an hour or so parked it and went to bed. This morning it was dead again (would crank once and give up). I jumped it and road to work (about 45 minute ride). I stopped the bike at the guard gates and the thing wouldn’t start again (same as last time, turn over once and die). I had to push start it to get to my shop. ......

Did I just luck out and come across two bad batteries?
is the battery tender killing them in any way?
Is there a special charger to be used on these cells and the regular one I’m using is killing it? Or Am I charging at too high of an Amprage (10 amps for about 4 hours)
Do the sv's just have horrible charging circuits?
I have a brand new battery and would hate to F it up by using the wrong charger/tender on it...

please help!
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post #2 of 5 (permalink) Old 08-06-2008, 11:26 AM
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Location: Winona Lake, IN
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I'm anti battery tender and think its best to disconnect and charge fully on a normal charger if the battery is going to sit for a month or more.
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post #3 of 5 (permalink) Old 08-06-2008, 08:16 PM Thread Starter
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man im a tool!!!
I took one of the dead batterys out and it sez on the side. charge 1.5 amps 5-7 hours 5 amps 1 hour..... I was charging the hell out of them!!! (10amps 2-3 hours!!!)
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post #4 of 5 (permalink) Old 08-07-2008, 11:58 PM
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Location: SE Michigan
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You fucked those batteries!!

If I'm not on a the bike the tender is... ALWAYS

aka Gas Man

Was: 2002 Kaw ZX-9R

is me till the
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post #5 of 5 (permalink) Old 09-19-2008, 03:50 PM
Join Date: Sep 2008
Posts: 9
Battery maintainers work great. Many people have motorcycles that they rarely ride. When a battery just sits, it self-disccharges of course, and in doing so sulfates.

A battery maintainer monitors the voltage of the battery and powers on to charge when the voltage reaches a certain low point, and shuts off when the voltage reaches a certain high point.

This keeps the battery from sulfating, prolonging the life of the battery. It also ensures the bike is always ready, when your ready to ride.

I would not recommend a maintainer that outputs more than 1.5 amps. 10 amps is definitely wayyyy tooo much for a motorcycle battery.

But a maintainer will ABSOLUTELY with out a doubt increase the life of the battery.
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