Switch on the charger. See below for the correct charging conditions depending on your type of charger.

For example, if the battery has a voltage of 12.16V, charge it for 10 hours at the recommended charge rate. When fitting the charger to the battery, connect the positive lead to the positive terminal and the negative lead to the negative terminal. Stop charging if the battery begins to gas freely (some gassing is normal during the last stages of charging) or if the battery temperature rises above 50°C.Yuasa 12v 60Ah 550A Car Battery YBX3075 (HB075 / HCB075) Yuasa 12v 60Ah 550A Car Battery YBX3075 (HB075 / HCB075) Modern cars often require more powerful batteries to power air conditioning stop/start systems sat navs in-car DVD players and phones. The following options are available in the Yuasa range. Yuasa YBX5075 Silver Series Battery A. Boost charging is not recommended except in exceptional circumstances e.g. a stranded customer, as this will reduce battery life, especially if a battery is boost-charged more than once.

Note. Many customers severely underestimate the amount of time necessary to charge a flat battery. This results in customers returning batteries saying that they have charged the battery but that it is still not holding charge. E. If you are charging a battery below 11.00V (over discharged) that has been in service, a specialised charger capable of providing a very high charging voltage may be necessary, and the recommended current may not be obtainable at first. In this case, monitor the current and adjust as necessary during the charge. If a battery has become over discharged, it will have lost both life and performance because of irreversible sulphation. Charging may reduce further its potential life. Constant Potential ChargersThese provide a very high initial current, and are used mainly to put some charge into a flat battery when it is needed urgently by the customer. The current falls as the battery state-of-charge increases, and the battery temperature is monitored to make sure it does not overheat. These maintain a fixed, constant, pre-set current throughout the charging period irrespective of the battery on-charge voltage. Do not charge AGM batteries on a constant current charger. A. Ideally, charge each battery on a separate charger unit. If this is not possible, charge batteries in series. We do not recommend charging batteries in parallel because it is not possible to control the amount of current passing through each battery. If batteries in different states-of-charge are being charged in series, each battery should be removed as soon as it is charged. (If you wait until the last battery is charged, some of the batteries will be overcharged).

C. Note. The majority of constant potential chargers are incapable of charging a severely over discharged (below 11.00V) battery in a realistic period of time. A minimum of 24 hours is normal. It might be impossible to charge an over discharged battery. Modified Constant Potential Chargers Terminal Layout: Negative (-) on left, Positive (+) on right ; with the terminals on the edge of the battery closest to you B. Never boost-charge any battery that is below 11.00 Volts as it will be too sulphated to accept a charge; scrap the battery or charge normally.C. Only use a boost-charger that limits the charging voltage to a maximum of 14.2 Volts and that has a temperature monitor. Yuasa are one of the world's largest manufacturers and suppliers of valve regulated lead-acid batteries with global manufacturing plants and an extensive marketing and distribution network throughout the UK and Europe.