OYEK YB9B (12N9-4B-1) motorcycle battery The batteries you buy from e-Moto.gr have a 6-month warranty as long as they are fitted at an authorised workshop or at our shop. Alternatively you can follow the steps below, which are also given in the pdf file under the photograph. Check the battery's voltage. Before you fit it, it must be at least 12.6 volt on a 12v battery. If the voltage is lower than 12.6 v, repeat the charging procedure. If you fit it on the motorcycle without charging it properly, its life will be significantly shortened. CHARGING CHECK Check the charging voltage by putting a voltmeter or multimeter on the battery with the engine running at 5,000 rpm - half throttle and the lights on. The values should be within the range the motorcycle's manufacturer gives. The ideal reading is usually 14 volt +- 0.20 v . Note: if all of the above is done you will be sure that every procedure the manufacturer recommends was carried out correctly. Every battery you buy from our shop we charge before collection completely FREE, ready to use.