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Old 01-14-2014, 12:26 AM   #1
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Default can an oversized battery cause a low voltage issue?

hello all. looking on the internet this is the only conclusion i can come to logically.

back in october, i rebuilt my 50cc chinese scoot and installed a BBK. the 5 year old battery was shot, so i figured what the hell and got a motorcycle battery designed to start a yamaha r1. something like 200cca. the scoot has never been able to charge the battery, and will barley charge it enough to get one start out of it after being on the trickle charge before a ride.

another issue i noticed was when i took it to storage at my grandmothers in november, it seemed like it was trying to die when taking off. only thing i can think, is not enough spark because it does not cut out at full throttle moving and does not act like its running lean.

ive tried a new rectifier, and i believe the stator is working fine based on internet specs on what it should be putting out. so the only thing i can gather is the battery is putting too much of a draw on the system.

thanks alot for any/all ideas!!!!!!!!

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Old 01-14-2014, 08:14 AM   #2
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its designed to charge the battery and run the engine thats all. you should have two separate systems, the stock one with a stock battery, then a separate system with the radio, any aftermarket lighting and a different way to charge it, either plug in charger or maybe run a alt off a belt on the engine or on the wheel somehow.
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Old 01-14-2014, 09:48 AM   #3
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Originally Posted by jwfirebird View Post
its designed to charge the battery and run the engine thats all. you should have two separate systems, the stock one with a stock battery, then a separate system with the radio, any aftermarket lighting and a different way to charge it, either plug in charger or maybe run a alt off a belt on the engine or on the wheel somehow.

He is talking about a 50cc scooter. He likely isn't concerned with a radio or aftermarket lighting.

The alternator only has to charge what the bike uses to start, and that has nothing to do with battery size. What are the specs for the stock battery for your scooter, and what are the specs for what you purchased. I am almost willing to be there isn't much difference.
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Old 01-14-2014, 09:54 AM   #4
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if you look at his other post he already has that stuff
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Old 01-14-2014, 10:12 AM   #5
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Put a garden hose in your hand and look at it. Now, look at the Olympic size swimming pool you need to fill. Its gonna take a lonnng time to fill. Now compare your alternator to the hose and the battery to the pool. That little itty bitty alternator can only handle charging a small battery and the minimal accessories on the bike itself. Not additional stuff like stereos and a big battery.
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Old 01-14-2014, 11:49 AM   #6
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good point mike.. what confuses me though, is id disconnected the stereo when i realized the battery was not charging. also, i replaced the stock headlights with LED headlights that draw less than half as much.

i just dont understand why when i leave on a full charge thanks to the trickle charger, i come back and the thing has got barley enough juice to start.
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Old 01-14-2014, 11:57 AM   #7
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if the battery is charged fully and cant start it, there is something wrong with the battery. or the connections are bad. some people forget the starter has to ground through the engine and has to be nice and clean, and so does the ground from the engine to the battery. if those are good i would check the battery without the cables connected if not 12 or higher you have a dead cell. if thats good put the charger on it and see if the voltage goes up. if all that checks out connect the cables and watch the voltage at the battery while cranking if it drops way low the battery is bad.
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Old 01-14-2014, 12:00 PM   #8
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Yea, either somethings wrong with the battery or you have issues with the electrical system.
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Old 01-21-2014, 09:54 PM   #9
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duralast battery is just dura crap. went to my grandmothers today and pulled the battery out. its been disconnected for the past 3 months. put it on the trickle charge when i parked it for 3 days to make sure it had good voltage. took the battery home with me, checked the voltage and it had less than a AA battery in it. ive had it on the 1 amp charge for about 6 hours now, and it is only at 10.4. take it off the charge and the voltage drops so fast its comical. it literally drops a tenth of a volt in less than a second. im going to leave it on charge overnight to give it the benefit of the doubt, and unhook it in the morning. if its dead when i get home from work, im taking it to AZ. i bought the friggin gold version for a reason.

man do i wish optima made motorcycle batteries!
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Old 01-21-2014, 10:24 PM   #10
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