I have a schwinn s350. And I charge the battery until the light turns green and I go ride it around the block and within 5-7 minutes, it's dead. No hills, I am running at full throttle through but you figure it would go further than that. Used a multimeter and it shows 24V before and after it is dead. I don't know if it is supposed to be like that or not. And how do you change the on/off switch? Just pry the old one off?
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Probably just the batteries. Stock Schwinn batteries don't last long.
I'd charge them individually with a 12V charger. Then do a "poor man's load test". Block the rear wheel off the ground. Attach your DMM to each battery separately and spin the motor at full throttle while applying brake. Apply enough brake to simulate a load. Note how much the voltage drops. Repeat on the other battery and try to replicate the same amount of load. Lead acid batteries are considered dead at 10.5V. If one or both drops quickly, they need to be replaced. Another indication that they have lost capacity is if they re-charge quite quickly after going "dead" on a ride.
After you install your new batteries, you should consider periodically re-charging each with a 12v charger to keep them more in-balance. That should help them last longer. Also, not a good idea to run them below 50% depth of discharge. Number of cycles drops dramatically as you increase DOD.
Yes, you can slip a thin blade under the edge of the switch and just carefully pry it off. There are two double-flag teminals on the backside.
It looks like your battery is defective, with one or more bad cells, because a fully charged "24 volt"lead-acid battery SHOULD read close to 27 volts, right after charging! (26.5 to 28.5 is typical, with good, freshly charged batteries) If your batteries seem to get excessively hot during charge, that would be an indication of a shorted cell. It is also best to replace all batteries/cells at the same time, with a matching set, to reduce chances of uneven charging or discharging, and be certain to fully charge the new batteries before first use! (each 12 volt lead-acid battery, freshly charged, should be near 14 volts, typically 13.25 to 14.25 volts, at normal room temperature)charging voltages are usually higher at COLD temperatures, and slightly lower at HOT temperatures.-Bob
Robert M. Curry