Home / News / What Depth Discharge and Why It So Importan

Whether you need a battery for your car, boat, golf cart, floor scrubber, scissor lift, emergency lighting or wheelchair, Federal Batteries has you covered.

Our batteries have been designed and engineered with the footprints, performance, and terminal options to respond to all user’s needs. With a wide variety of designs and sizes, and the unique demands of the applications and vehicle requirements, if you don’t choose the right battery with the right terminal you won’t be able to hook it up.

A battery’s depth of discharge (DoD) indicates the percentage of the battery that has been discharged relative to the overall capacity of the battery. Depth of Discharge is defined as the capacity that is discharged from a fully charged battery, divided by battery nominal capacity. Depth of discharge is normally expressed as a percentage. For, example, if a 100 A h battery is discharged for 20 minutes at a current of 50 A, the depth of discharge is 50 * 20 / 60 / 100 = 16.7 %.

IMPORTANT – Ensure the correct PPE is used whenever handling, using or charging Lead Acid Batteries. Staff that perform battery charging or testing MUST have completed the charging and safety training and have undertaken the competency test. (Ref Federal Batteries charging and safety procedures document).

 

Why is charging correctly so important?

To maximise the life and performance of batteries and get the best possible life span and the most optimised performance.

Maintenance Free’ is an unfortunate label for an automotive lead acid battery as all batteries require some maintenance (keeping the battery top clean, keeping attached cables tight and clean, keeping the battery charged or re-charged as soon as possible following a significant discharge etc. The maintenance free label is usually used to convey that the battery will not require water additions. This can be facilitated by the selection of grid hardeners (e.g. calcium).

There are many variations of lead acid batteries. Let’s clear up some of the confusion surrounding the main type and what their typical applications are.

Flooded Batteries are the most common type of Lead Acid battery and widely used in Automotive. They are called flooded because of the acid that is free flowing within the casing in which the battery plates are suspended.  These batteries are still the most cost effective and least cost per Amp hour of any type.