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Electric EZGO Electric EZ GO Marathon, Medalist, TXT and RXV. |
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06-01-2019, 07:19 PM | #11 | |
Gone Wild
Join Date: Apr 2019
Location: North Alabama
Posts: 165
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Re: Load tested my US batteries- here are results
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Haven't seen one like johnnieB recommends so maybe i'll have to put one of those on my list. I do have the refractometer like he listed and then I have one of these https://www.amazon.com/dp/B000JFHMRU..._t2_B0002KKTYU They read within 5 of each other. |
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06-01-2019, 07:47 PM | #12 | |
Techno-Nerd
Join Date: Jun 2011
Location: West Virginia
Posts: 19,654
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Re: Load tested my US batteries- here are results
Quote:
Personally, I don't see all that much of a need for them since the individual cells in the batteries used in cars and carts cannot be replaced and a bad battery can be found with a DVM. |
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06-03-2019, 03:37 PM | #13 | |
Gone Wild
Join Date: Feb 2017
Location: south florida
Posts: 304
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Re: Load tested my US batteries- here are results
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06-04-2019, 05:24 AM | #14 |
Not Yet Wild
Join Date: Apr 2016
Posts: 21
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Re: Load tested my US batteries- here are results
I was having same issues with 1 yr old US. Bought a Lester Summitt II Charger and has made all difference in the world. Has 3 phase charging and Bluetooth app so you can see the charge info and equalize if needed. The original charger was only getting pack to 80% for what ever reason.
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06-04-2019, 05:51 AM | #15 | |
Gone Wild
Join Date: Apr 2019
Location: North Alabama
Posts: 165
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Re: Load tested my US batteries- here are results
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06-04-2019, 10:08 AM | #16 | |
Techno-Nerd
Join Date: Jun 2011
Location: West Virginia
Posts: 19,654
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Re: Load tested my US batteries- here are results
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I've upped the Regen amps since then and RPM limited the motor to 6500RPM. |
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06-04-2019, 10:31 AM | #17 | ||
Techno-Nerd
Join Date: Jun 2011
Location: West Virginia
Posts: 19,654
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Re: Load tested my US batteries- here are results
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Quote:
Modern chargers that don't shutoff until the on-charge voltage stops increasing (dV/dT technology) do a better job and those that actually have a charging profile specifically for US Battery brand batteries do the best. The DPI Gen-III the OP has is what I consider the gold standard since it has dV/dT shutoff technology followed by float charging, plus it has a step-down transformer instead of a solid state input stage for better reliability. Unfortunately, the DPI Gen-IV doesn't do float charging, and neither do the DPI Gen-III that are currently being sold by DPI, or at least that is what I understand. I don't understand why DPI discontinued float charging, it prolongs the battery's lifespan. When/If I go to 48V, I'll probably go with a Lester Summit-II or a Yewy. |
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06-06-2019, 12:49 PM | #18 |
Gone Wild
Join Date: Feb 2017
Location: south florida
Posts: 304
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Re: Load tested my US batteries- here are results
Will this one work for my needs?
https://www.amazon.com/gp/product/B0...KIKX0DER&psc=1 Also what is the process for using one of those in the intended way with minimal user error? |
06-06-2019, 01:00 PM | #19 |
Gone Wild
Join Date: Apr 2019
Location: North Alabama
Posts: 165
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Re: Load tested my US batteries- here are results
If you want to check the specific gravity of each cell then yes that should suit your needs. JohnnieB and some of the others just check with a Digital Voltmeter as he stated earlier.
They are pretty straight forward to use, just pull up some acid out of each cell and read the number, I also flush the tester between each cell with distilled water to get an accurate reading of each cell. After checking the specific gravity of my new us batteries I contacted usbattery because my lester 2 charger was showing some high voltage during charging and after they looked at the specific gravity of each cell they determined that the batteries were still in the installation stage and as the specific gravity got higher then the high voltage that I was seeing will drop. That may be one of the advantages of checking the specific gravity. Check level every month and fill with distilled water only. Good luck |
06-06-2019, 02:03 PM | #20 | |
Techno-Nerd
Join Date: Jun 2011
Location: West Virginia
Posts: 19,654
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Re: Load tested my US batteries- here are results
Quote:
Got mine at an auto parts store years ago, didn't know Amazon carried them. The batteries have typically been sitting still overnight, or longer, when a hydrometer is used, so the electrolyte is stratified. In a nutshell, pure sulfuric acid has a SG of about 1.84 while pure water has a SG of 1.000 and the electrolyte is about 3 parts sulfuric acid to 7 parts water. The acid molecules are 85% heavier than the water molecules, so they are drawn toward the bottom of the cell while the lighter water molecules rise towards the top and the net result is the electrolyte at the top of the cell can have a significantly lower SG than the electrolyte at the bottom of the cell. I mix the electrolyte by aspirating electrolyte from just above the plates and carefully squirting it back into the cell, and repeating several times, depending on how long the batteries have been sitting still. Then I aspirate enough electrolyte to float the float, read the numbers off the float at the air/liquid interface and add/subtract the number of points on the thermometer. After taking the SG reading, be sure to squirt all the electrolyte back into the cell it was aspirated from. |
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