Yuasa lead-acid batteries are built to the highest standards. They are manufactured, in most cases to correspond with or exceed the vehicle manufacturer’s requirements and specifications. 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. There are many different types of hand held digital conductance tester on the market. They generally give a good indication
of problems but the following points should always be taken
into account.

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. We receive data from battery manufacturers and this may be subject to change and / or manufacturing tolerances.Different battery manufacturing design techniques can significantly effect the reading on one digital conductance tester as common algorithms have to be used. For example, batteries designed with more durability in mind tend to carry more material and higher density, this is usually reflected in a lower initial voltage, but longer discharge times. Digital testers can only determine realistically the initial internal resistance of the battery at the particular state of battery, not how much material is available. This can cause considerable difference between the indicated CCA data and the real CCA data obtained in a laboratory under real current loads to the appropriate battery standard specified. CCA readings can be measured according to a number of international standard SAE, EN, DIN or IEC, Within the EN 50342: 2006 standard two requirements are listed: EN1 & EN2. Typical Conductance testers are calibrated toward EN2 standard, however the ETN numbering system makes it difficult for the normal man to understand which standard is being used on the battery.

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 Chargers The condition of battery cables and terminal connections can influence the reading on the hand held tester. Terminal Layout: Negative (-) on left, Positive (+) on right ; with the terminals on the edge of the battery closest to you It is good practice to wait for about 20 minutes for the gases to clear before removing the leads from the battery as some chargers remain ‘live’ and can cause a spark. If you are using a constant-current charger or a boost-charger, remove the vent-plugs or manifolds before charging. There is no need to remove the vent-plugs or manifolds if you are using a constant-potential or a ‘smart’ charger.

Constant Current Chargers

If a battery is allowed to stand in a discharged state either on or off a vehicle for a period of time, a chemical reaction takes place which will permanently impair the performance and life of the battery, this process is called “sulphation”. The Yuasa HSB110 Silver 12V Car Battery 5 Year Guarantee allows around 50,000 engine starts as compared to around 20,000 on a normal battery. The Silver car batteries come fully charged, ready to fit, and are completely maintenance-free. Switch on the charger. See below for the correct charging conditions depending on your type of charger. C. Only use a boost-charger that limits the charging voltage to a maximum of 14.2 Volts and that has a temperature monitor.