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Reduction of runtime between battery charges.

Runtime has dropped from 3-4hrs to 1-2 hrs. Battery pack was replaced with 2 - 12V, 12AH sealed batteries. This did not help. I made some measurements with the scooter running on a flat surface with a 175# load (me) at full foward speed: 5 - 6 amps @24.0Vdc. Motor plate info is; 24Vdc, 3.0Amax, 270W. Contacting Drive tech line was of no help when I asked if these measurements are normal. Neither was the local service shop. I am thinking the motor is drawing too much power. Anyone have an opinion?

Thanks in advance
Tony

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  • acpapp Jan 26, 2009

    Thank you for your response. The no load measurements are; 2.5A at 24.6V, battery voltage at idle was 25.8V so about a 1V drop during no load operation. Same voltage drop when checked with a 175# load. I also retested the scooter with the electric brake by-passed and obtained the same results. FYI; All measurements made at the battery pack.



    I also had the batteries load tested and they checked OK. He did comment, however, that with a 6 amp draw, he would expect the 12 AH batteries would need recharging after about 1.5 hours of operation.



    I checked the drive train for foreign matter and for unusual resistance or noise. All seems well.



    Any additional help would be most appreciated.



    Regards, Tony

  • acpapp Mar 12, 2009

    Thanks for your reply,



    Checked all the contacts, cleaned as needed(not much evidence of corrosion), and applied dielectric grease upon reassembly. Also, ensured battery clips and contacts are clean and tight. No change in performance.



    I'm astonished that I cannot get an answer from many other sources, including the manufactures technical dept., as to the normal current draw for this unit! I guess we truely have become a replace and see society. I refuse to join, however!!



    Anyother suggestions would be most appreciated.



    Regards, Tony

  • idare_ya May 11, 2010

    would it be possible for you to test the no load draw? Is threre alot of resistance in the drive train? inspect the drive train possible somthing caught or causing excessive resistance.

  • ruddski May 11, 2010

    If the scooter is a Drive take apart scooter there are contacts that go from the rear the the front section that get dirty as they are open to air and can get dirty, split the scooter in half and check the contacts and clean them.(bad design) Also check to make sure that the clips on the batteries are tight and all the contacts back towards the rear section.

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The only other things I can think of is a bad motor brush, or a bad gear not turning freely in the gear box. I am not as familiar with the drive scooter, but it should have two caps on the motor that have brushes in them. The brush is held in by the cap, unscrew it and take brush out ( it is spring loaded) and check contacts. If it is worn down too much or unevenly worn it needs to be replaced, also if the spring is not set right or the brush is stuck it will cause drag, Put the brushes back in the same way you took them out if they are good, if you need to replace you need to wear them in by putting rear wheels of scooter up on something and run scooter by putting a rubber band on throttle. If it's the gear box it needs to be replaced

Posted on Mar 13, 2009

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