In order to prolong the life of your QUASAR VM520 replacement battery please read the following:

Your QUASAR VM520 battery is charged during production in order to test it. Your QUASAR VM520 rechargeable battery will discharge between the end of the production and the moment you receive it. That is why your QUASAR VM520 battery will have to be charged before you use it. You can use your existing charger or an external charger this will optimize charging of your QUASAR VM520 battery and prolong the life of your camera power supply.

Your QUASAR VM520 rechargeable battery discharges slowly and progressively when not in use. The self discharge rate is about 1% of the battery's capacity per day at room temperature. The higher the temperature, the faster your VM520 battery will discharge. If you intend to leave your QUASAR VM520 battery for a prolonged period without use then a service charge is recommended from time to time, taking in to account the self discharge rate and time between using your QUASAR VM520 battery.

Rather than supplying original QUASAR VM520 batteries, we supply replacement VM520 batteries made by Uniross and Hahnel. Our VM520 batteries have a two year warranty, represent excellent value and meet or exceed the original specifications. We also offer free delivery on all our products including the VM520 battery.