Razor i have ben charging m phone and the phone says that it is charged but as soon as i make 1 call for 10 min the phone then states the battery is low.

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.

References:

Battery Maintenance 101 How to Extend Battery Life of Razor Scooter...

BU 804b Sulfation and How to Prevent it

Deltran Battery Tender