Battery Load test on 36V cart reading 27.5V

mattadata

My 36V TXT PDS cart is stock. With 2 adults and 2 kids going up a slight hill, the voltage reading from the charging port dropped to 27.5V at its lowest.

Is this a sign its time for new batteries?

In order to load test each battery individually, can it do it while the rear axle is jacked up in the air? Or do I need to actually drive it around and test each battery?

Thanks

BGW

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crash test dummy

yes batteries are dieing
yes you need to test it while driveing
NEVER run motor at speed while cart is jacked up

HiTechRedNeck

Motor go Boom

JohnnieB

Spinning the tires in the air doesn't load the batteries.
Driving the cart up a hill while monitoring the voltage, is the best way for a cart owner to do it, unless you want to invest about $1,500 in a load tester.

Dropping to 27.5V is mighty low, but it depends on what the SoC was at the time.

Put the pack on an overnight charge, wait 12 hours after the charger shuts off and then measure the pack voltage and the individual battery voltages.
Pack should be 38.2V, each battery should be 6.37V and all six should be within 0.1V of each other.

Drive cart on relatively level ground for an hour (or less if cart starts to slow down), wait about 15 minutes after stopping and measure the voltages again.

The voltages will be lower, but all siz batteries should still be within 0.1V of each other.

The SoC can be estimated by those voltages and max run time can be calculated.

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However, it does sound like your batteries are approaching the end of their useful life.