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| Electric Yamaha Electric Yamaha Golf Cars; G1 through "The Drive" and U-Max Utility Vehicles |
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10-22-2019, 11:54 AM
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#1 |
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Gone Wild
Join Date: May 2016
Location: California
Posts: 210
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New batteries quick discharge
Good morning all. My brother bought new blackbox trojan 8v's for his 2011 ydre. While charging, the batteries read 55-56 volts which I believe is normal. However, after unplugged for 12 hours the pack read 50.01 yesterday. He took a 30 second spin, and the pack had dropped to 49 volts. I previously unhooked the voltage reducer in case it was drawing. The cart is otherwise stock. Any thoughts? Thanks!!
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10-22-2019, 12:05 PM
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#2 |
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Happy Carting
 Join Date: Dec 2007
Location: Southern California
Posts: 73,406
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Re: New batteries quick discharge
55 is hardly a full charge and 50.9 is normally what you want to see from a 48v pack at rest.
You may need a better charger? |
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10-22-2019, 12:52 PM
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#3 |
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Gone Wild
Join Date: May 2016
Location: California
Posts: 210
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Re: New batteries quick discharge
Thanks Scottyb. His charger appears to operate and shut off as normal, but I’ll try mine out to see if that’s the issue. Appreciate it!!
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10-22-2019, 04:09 PM
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#4 |
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Gone Wild
Join Date: May 2016
Location: California
Posts: 210
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Re: New batteries quick discharge
So I used my charger on his cart, and after charger showed solid green (full charge) the cart was at 51.0 right when unplugged. I know this is low, but am at a loss as to why it isn’t fully charging.
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10-22-2019, 04:11 PM
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#5 |
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Gone Wild
Join Date: Sep 2012
Location: Charlotte, NC
Posts: 9,329
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Re: New batteries quick discharge
Make sure the charger receptacle positive lead is connected to the pack positive battery post so all batteries are charging.
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10-22-2019, 04:44 PM
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#6 |
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Gone Wild
Join Date: May 2016
Location: California
Posts: 210
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Re: New batteries quick discharge
Just verified it is. If it helps, each battery is between 8.46-8.5 volts after charge.
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10-23-2019, 02:03 PM
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#7 |
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Gone Wild
Join Date: May 2016
Location: California
Posts: 210
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Re: New batteries quick discharge
Anything else you folks suggest I check? Frustrating. I sure appreciate your help as always..
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10-23-2019, 02:38 PM
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#8 |
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Over This Interview Is...
Join Date: Jun 2012
Location: AZ
Posts: 17,449
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Re: New batteries quick discharge
8.46 is about 97% charged & 8.50 is 100% charged.
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10-23-2019, 03:25 PM
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#9 |
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Gone Insane
Join Date: Oct 2016
Location: Richmond, VA
Posts: 14,214
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Re: New batteries quick discharge
Sounds like the charger and the batteries are reading low. You used 2 chargers. Any chance your meter is off?
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10-23-2019, 04:33 PM
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#10 |
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Gone Wild
Join Date: May 2016
Location: California
Posts: 210
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Re: New batteries quick discharge
The in-dash volt meter as well as my hand held meter are reading right about the same. Gonna replace all battery cables today. Could this by chance be the reason it's not fully charging? THx
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