The conventional choice isn’t always the best choice, and many material handling companies are discovering that this is true when it comes to powering their electric equipment.
Lead acid batteries, a traditional choice for managers who oversee the usage of forklifts and other material handling equipment in their operations, have long been the standard battery choice.
However, more companies are now turning toward the newer technology in lithium-ion batteries to increase safety and efficiency in day-to-day operations and improve their bottom lines. One of the reasons behind this move is because of the drawbacks associated with the charging of lead acid batteries.
Below we’ll explore some of these drawbacks, and how newer technology is helping crews overcome them.
Lead acid batteries generally have a run time of between 5 and 6 hours. When they need to be recharged, that process takes approximately 8 hours. Although the charging process completes in 8 hours, another 8 hours of cooling down time is typically required. This means that the true amount of time necessary for a lead acid battery to go back into service is closer to 16 hours.
Lithium-ion batteries, on the other hand, generally have a run time of between 7 and 8 hours. When they need charging, it only takes approximately 1 to 2 hours, offering the option for crews to “opportunity charge” the batteries during breaks or in between shifts. Lithium-ion batteries also do not require a cooldown period, which means that they can immediately go back into service after being charged.
The charging process is much more complex for a lead acid battery. Here’s what it looks like:
The bottom line is that the charging process for lead acid batteries is time consuming and labor intensive.
The charging process for a lithium-ion battery is much less complicated. That’s because a lithium-ion battery can remain in the forklift or other material handling equipment during charging and is simply connected to a battery charger.
Lithium-ion batteries do not require a separate charging and/or cooling space, and they do not require watering. This saves valuable space and labor time.
Lead acid batteries are made from toxic lead and sulfuric acid. If a battery is overcharged, this electrolyte solution can overheat, which then causes hydrogen and oxygen gas to form. This increases the pressure inside the battery.
While the battery is designed to relieve pressure build-up, it can cause the water to boil out of the battery, potentially destroying the charge plates or the entire battery. Even worse, if the battery overheats and the vent caps don’t function properly, there may not be a way for the gas pressure to relieve itself other than an instant explosion. This can cause severe damage to your facility and possible harm to your employees.
The cells of a lithium-ion battery, on the other hand, are completely sealed, so there is no risk for spills to occur. Best of all, the battery management system (BMS) for a lithium-ion battery monitors cell temperatures to ensure they remain in safe operating ranges.
You can read more about safety issues associated with lead acid batteries used as a power supply for material handling equipment in our article, The Top 5 Ways A Lithium-ion Battery Makes Your Forklift Safer.
Each of the above charging drawbacks can add up to significant costs for a business, especially for a company that utilizes multi-shift operations.
Because a lead acid battery takes nearly two shifts to charge and cool down, a company that has a round-the-clock operation must have three batteries available per forklift or piece of equipment.
Companies that invest in lithium-ion batteries only require one battery per piece of equipment since lithium-ion can be opportunity charged.
The downtime associated with charging lead acid batteries versus lithium-ion batteries also comes at a substantial cost for companies. In fact, one major equipment manufacturer realized it could save over $1 million a year by switching to lithium-ion batteries.
One major cost associated with charging lead acid batteries that is often overlooked is the allocation of warehouse space for a battery room to safely charge and store batteries while cooling. With the use of lithium-ion batteries, this space can often be recaptured for more productive use.
Lead acid batteries have long been the traditional choice for companies that utilize forklifts or other pieces of material handling equipment as part of their operations.
However, there are several drawbacks associated with the time it takes to charge a lead acid battery, the process by which this type of battery is charged, the host of dangers this presents for workers and what these mean for a battery’s true cost.
These concerns are leading operations managers to question whether their lead acid batteries are the best option, and more companies are making the switch to the newer, safer and less costly over time technology that lithium-ion offers.