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Most equipment running on rechargeable batteries have one thing in common: if you let the battery sit there for long periods of time without recharging, the charger is not made to bring the battery back up to spec. The battery pack, if it is still good, needs a "kick" or "boost" from some other strong supply to get it started. The other solution would be to replace the battery pack all together. If you have a friend with a similar scooter, you can try your new charger on his scooter to see if it works. Hope this helps!
You can extend the life of your scooter's battery if you take proper care of it. Most people report trouble in getting more than a year or two out of their razor scooter battery set. This is actually a common problem with vehicle batteries.
Keep your battery charged
It is recommended to keep your battery fully charged to avoid the build-up of sulfate-ion inside it. Sulfate-ion accumulates when the battery is in a discharged state for a long time.This is the most common reason of premature depletion of lead acid batteries. This can be easily avoided if the scooter battery is kept in a constantly charged state.
Charge you Razor Scooter Battery during the Off-Season
Even if not used Sealed Lead Acid Batteries will self discharge over long periods. This will leave the battery in a not fully charges state which will enable the sulfate-ions to build up inside the internal plates which will slowly deplete the battery's capacity. In order to prevent that, you should charge the razor scooter battery at least once every three months when it is not in service.
Use a Battery Tender
Battery Tender chargers are a great way extend the life of your SLA batteries as they are designed to fully charge and maintain a battery at proper storage voltage without the damaging effects caused by trickle chargers.
check your charger and batteries with a multimeter and make sure that they are showing the proper voltage, also visually inspect the batteries for bulging or swelling, probably one or both of the batteries are bad
Depends, some tabs are directly soldered to the batteries themselves so you will need a soldering iron to remove the tabs. After that, it wouldn't be too hard to remove and replace.
Keep in mind that these take 2x12volt batteries and these lead-acid type batteries may take a long time to charge depending on the current your charger is supplying.
If you plan to charge the two batteries with the stock charger, then you would have to wire the 2 batteries in series for 24volts (stock charger 24v) and for convenience you may also want to head out to your local electronics store to see if they have the female socket that the charger goes into, and possible some wire, connectors/tabs that attach to the batteries and possible some small alligator clips if required.
Problem is not the batteries then. Replace the controller. The controller could be resisting some of the charging current to the battery.
But first try this:
Charger the scooter with it OFF
Directly connect the charger to the battery
If still the same problem then:
Directly connect the charger to the battery then, connect the motor leads directly to the battery and see how long it runs. It with new the batteries it should run longer than a minute. If it does than something is definitively wrong with the controller.
If it is a fuse problem then try looking for a fuse box in the controller or charger. If not then take it back, unless stated in the manual that you need to enter a fuse before it will charge, the scooter should charge right out the box.
Another thing you might want to try is to turn the scooter off before charging.
This could be a sign of a dying battery, although it charges and lights the green light it cannot maintain enough juice to power the machine when it has weight on it.
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