In order to prolong the life of your Sony HVL35K replacement battery please read the following:

Your Sony HVL35K battery is charged during production in order to test it. Your Sony HVL35K rechargeable battery will discharge between the end of the production and the moment you receive it. That is why your Sony HVL35K 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 Sony HVL35K battery and prolong the life of your camera power supply.

Your Sony HVL35K 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 HVL35K battery will discharge. If you intend to leave your Sony HVL35K 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 Sony HVL35K battery.

Rather than supplying original Sony HVL35K batteries, we supply replacement HVL35K batteries made by Uniross and Hahnel. Our HVL35K 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 HVL35K battery.