![]() Please keep in mind that most OzCharge ® battery chargers have selectable current outputs. (For Lithium batteries, refer to your battery manufacturers specifications for maximum charge current as this could be anywhere up to 100% of the Ah capacity) In the case of a 100Ah battery that would be a maximum of a 30 amp charger. Step 4 - Selecting a charger sizeĪs a rule of thumb your battery charger should be 10% - 20% of the Ah rating of the battery.Į.g A 100Ah battery would require a 10 Amp charger as a minimum. To prevent overcharging, you should keep the charger size to within 30% of the total capacity. The OzCharge ® PRO L series of chargers includes a Lithium charge algorithm. Lithium batteries require a specific charge at specific voltages and should never be charged by a battery charger that has not specifically been designed to charge lithium batteries. This is often referred to as trickle charging. All OzCharge ® battery chargers perform both functions and understanding each charger's limits is important. Battery maintenance on the other hand is when you just want to keep a battery topped up (maintained).įor instance, if you're storing a motorcycle that you only ride a few times a month but want to ensure it's ready to go on a sunny afternoon you would require battery maintenance as opposed to battery charging. Step 3 - Identify what you need the charger forīattery charging is when you are recharging a flat or dead battery to full. ![]() If you are unable to find this information, please contact your battery manufacturer. Note: These details can be found on the battery label located on the top or side of the battery. If the battery label does not indicate the Ah rating, to get an approximate Amp hour (Ah) rating, multiply the Reserve Capacity (RC rating) x 0.6. This tells us that the battery is designed to discharge 5 amps for 20 hours until is reaches 10.5 Volts (which is the international test benchmark for dead flat). Divide the 20 into the 100 gives you 5 amps. Understanding the “C” rating of a battery can help you determine a lot about the Battery. There is an old rule of thumb where you divide 7.25 into the CCA to determine the Ah of the battery but it’s not always an accurate conversion. You should always download the manufactures data sheet to check the correct Ah rating. On flooded, wet or Calcium batteries such as start batteries the Ah is often not displayed.Ĭonverting CCA to Ah is not that easy. This is a universal number that helps us understand the size or electrical capacity of a battery. When it comes to charging, we need to determine the Ampere hours (Ah) of the battery. Lithium, AGM and GEL batteries are typically rated by a “C” Rating.Flooded (Wet) or Calcium are typically rated in Cold Cranking Amps (CCA) and/or Reserve Capacity (RC).The rating of batteries can be confusing and different rating types are used for different batteries. Step 2 - Identify the size of the battery you need to charge
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