Following our earlier feature on Aeson Power sodium-ion battery technology, we’ve now had the chance to try one in a real-world scenario. The unit in question is the NaPulse Black NS40L, fitted to a 2012 Perodua Myvi 1.5SE—arguably one of the most relatable test beds for any new automotive tech in Malaysia.
Priced between RM369 and RM389, the NaPulse Black sits slightly above a typical maintenance-free lead-acid battery. But as Aeson Power positions it, this isn’t just a replacement—it’s an upgrade built on newer battery chemistry, with the promise of improved performance and longer lifespan.
What Makes It Different?
At a glance, the NaPulse Black looks like any other 12V battery. But internally, it swaps out traditional lead-acid chemistry for a sodium-ion system—something that Aeson Power says delivers better thermal stability, more consistent voltage output, and improved durability over time.
According to the company, the NaPulse Black range is designed as a direct replacement for commonly used battery sizes, meaning installation remains completely straightforward. In our case, the NS40L dropped straight into the Myvi with zero modifications required.
There’s no coding, no ECU reset, no special procedure—it’s as plug-and-play as it gets.
First Impressions: The Weight Says It All
Before even starting the car, the biggest difference is immediately obvious: weight. Or more accurately, the lack of it.
The NaPulse Black NS40L is significantly lighter than a conventional lead-acid battery. Aeson Power claims a reduction of up to 60%, and judging by how it feels in hand, that figure doesn’t seem exaggerated. It’s one of those rare upgrades where the benefit is instantly tangible.
Once installed, the next noticeable change comes during ignition. The engine fires up quicker, with a more immediate and decisive crank. It’s a subtle improvement, but one that becomes easier to appreciate the more you drive the car.
Smoother, Quieter… Or Just New?
At idle, there’s also a perceived improvement in refinement. The engine seems to settle more smoothly, with slightly less vibration coming through the cabin.
It could be down to the battery delivering a more stable voltage—something Aeson Power claims is a key advantage of sodium-ion technology. Or it could simply be the effect of replacing an older battery with a fresh one.
Either way, the end result is the same: the car feels marginally more refined when stationary, and possibly even a touch quieter.
It’s not transformative, but it’s noticeable enough—especially in a car like the Myvi, where small changes tend to stand out more.
Backed By Promising Tech
On paper, the NaPulse Black brings a few advantages that go beyond just weight and starting performance.
Aeson Power claims the battery offers a lower self-discharge rate compared to conventional lead-acid units, meaning it holds charge better when the car is left unused. It’s also said to be more resistant to heat—an important factor in Malaysia’s climate, where high under-bonnet temperatures can accelerate battery wear.
Another key point is durability. The company says the battery can withstand deeper discharge cycles and recover better than traditional batteries, which typically suffer permanent damage if drained too far.
There are even claims of improved efficiency, with up to 5% fuel savings attributed to more stable electrical output—though in real-world driving, that’s something that would require longer-term observation to verify.
The Real Question: Is It Worth It?
At RM369 to RM389, the NaPulse Black NS40L isn’t the cheapest option in the market. A conventional NS40L battery will cost less upfront, and for many owners, that’s usually the deciding factor.
But Aeson Power claims a lifespan of up to three years, backed by a one-to-one replacement warranty. If it holds up over that period, the cost equation starts to shift.
Instead of replacing a cheaper battery more frequently, you’re potentially paying once for a longer-lasting unit—while also benefiting from better performance and lower weight.
Verdict: So Far, So Good
As it stands, early impressions are positive.
The NaPulse Black NS40L doesn’t dramatically change how the car drives, but it does improve the ownership experience in small, meaningful ways—quicker starts, smoother idling, and a noticeable reduction in weight.
More importantly, it does all of this without requiring any change in how you use or maintain your car.
Of course, the real test will be longevity. If it delivers on Aeson Power’s claim of a three-year lifespan, then the slightly higher upfront cost becomes much easier to justify.
For now, the verdict is simple – so far, so good, and if this is where everyday car batteries are heading, sodium-ion might just be the quiet upgrade we didn’t know we needed.
