Every fleet manager knows the dreaded sound of a non-start on a cold December morning. You sigh,  and rightly so. Because that one battery failure can kickstart a chain of expensive events.

That’s bad for business. Not only do you have to pay to diagnose the problem and potentially return the vehicle to your depot, but your technicians have to divert their attention away from other jobs. You also lose income from that vehicle, the driver might have to sit around waiting and your brand reputation takes a hit.

The life of a car battery can be shortened by several factors. Having these in mind during your operations can go a long way in reducing those failures.

How do temperature extremes reduce fleet battery lifespan?

When it comes to battery performance, temperature is the biggest variable.

Sometimes, your vehicles might get too hot under the bonnet, whether that’s because of an airflow issue or something more problematic deeper in the engine or electronics. If your fleet tends to spend most of the day in traffic, that can further restrict airflow.

Either way, high temperatures around the battery accelerate plate corrosion and electrolyte evaporation. Stop-start routes and long idle times exacerbate the issue.

On the other hand, cold temperatures are their own problem. In winter, a battery’s voltage may appear fine, but its cold cranking amps (CCA) drop significantly.

That’s because the electrolyte is thicker (more viscous) in the cold. Since the electrolyte allows ion transfer, you get fewer ‘amps’, the rate at which electrons flow.

Lower CCA combined with stop-start driving means the alternator doesn’t have enough time to restore charge to the battery cells. Soon, your batteries start to stratify.

As a fleet manager, you could minimise the impact of temperature by parking your vehicles inside or under cover, if possible. Ensure there’s good airflow and that the coolant systems have been flushed. Test all your batteries before and during winter to look for any signs of developing problems.

At the end of the day, nobody can stop winter. But a few small changes can put you in a good position to deal with whatever comes your way.

How do charging irregularities shorten cycle life?

Some battery problems can start with the onboard charging system. Your drivers might notice minor electrical issues as the problem builds. This could include flickering lights or a struggling starter motor.

An alternator with a drifting regulator or a high-resistance ground can change the voltage enough to overcharge or undercharge the battery.

Either way, you have a problem. Too-high voltages accelerate plate shedding; chronic low voltages lead to sulphation. And sulphation means a lower SoC and higher internal resistance, leading to longer recharge times, more strain on the alternator and early component failure.

The best way to identify the problem is with a smart tester. You want your technicians to have real-time cycle data. You also need them to run conditioning cycles every few weeks (or months, depending on the load) to restore the lead surfaces and rebalance capacity.

What operational habits and loads shorten service intervals?

Incomplete recharge is one of the most unavoidable problems for fleet operations. Delivery vans, taxis, buses, council fleets and even emergency vehicles often have to make numerous short, stop-start runs each day.

These journeys don’t give the alternator enough time to replace the start-up draw. They’re at risk of ending the day at 80% SoC or less. And over time, you’ll lose all that extra reserve capacity.

Electronics can be complex, and accessories sometimes draw more from the battery than you realise. Telematics, dash cameras, refrigeration units, power supplies all pull current, even when the engine’s off. Especially if they haven’t been configured correctly or they’re low-budget products.

Then there’s parasitic drains to consider. Tiny manufacturer or aftermarket errors could draw just enough current to drop the voltage below 12.4 V over a few days or even overnight, depending on the draw.

No matter the root cause, the result is regular deep discharge in your batteries, which can lead to permanent plate damage.

Diagnostic testers and chargers from Rotronics will help you quantify these problems. Our mid-range and top-of-the-range chargers connect with the ROBIS platform. This allows them to log every charge cycle, flag undercharge events and record capacity recovery after maintenance (among many other things).

The more data you have, the more informed decisions you can make. The result is fewer out-of-service vehicles and far lower total cost per battery per year.

Rotronics’ products enhance car battery life

As a fleet operation, battery health is directly tied to business health. Working batteries means business is go-go-go; low CCA, parasitic drains or other causes of discharged batteries mean everything grinds to a halt.

Thankfully, you don’t need to leave battery health to chance. Rotronics battery testers and diagnostic chargers provide your fleet team with the tools they need to identify and resolve emerging problems,  all at a reasonable investment.

To explore how this can work across your operations, get in touch with us at Rotronics today for an obligation-free, friendly chat.