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In this video you can see how I change the battery in my solar roller shutter. Before you change the battery, you should check whether the battery is actually defective and not the solar panel or the charge controller. After about 10 years, individual components can stop working. There are no longer any original spare parts for these older solar roller shutters, unless you replace the entire unit, consisting of the motor, solar cell, battery and control unit. The battery is available in accessory stores: Replacement battery for Velux solar roller shutters from year of manufacture: May 2012 to June 2022 Replacement battery 10.8V 2200mAh NI-MH roller shutter solar & roof window used for Velux 946933 with cable and plug (*) https://amzn.to/48tjNOK BENNING DUSPOL digital Digital True RMS voltage tester (test type 2-pole, voltage measuring range 1 V - 1000 V AC / 1200 V DC, continuity test) 50263 (*) https://amzn.to/4bI3kJ8 Affiliate links / advertising links The links marked with an asterisk (*) are so-called affiliate links. If you click on an affiliate link and purchase via this link, I receive a commission from the online shop or provider in question. The price does not change for you.