Standard bobbin-type LiSOCl2 battery chemistry is overwhelmingly preferred for low-power remote wireless devices. The major drawback of this chemistry is its inability to deliver high pulses, as it can experience a temporary drop in voltage when first subjected to a pulsed load—a phenomenon known as transient minimum voltage (TMV).
A way to circumvent TMV is to use a battery that combines a standard bobbin-type LiSOCl2 cell with a hybrid layer capacitor (HLC). The battery and the HLC work in parallel—the battery supplies low-current background power in the 3.6- to 3.9-V nominal range, while the single-unit HLC delivers periodic high pulses to power two-way wireless communications. The HLC also has a bonus: a unique end-of-life voltage curve plateau that can be interpreted to generate low-battery status alerts.
Supercapacitors are commonly used to minimize TMV in consumer electronics but are ill-suited for most industrial applications due to drawbacks like bulkiness, a high annual self-discharge rate, and an extremely limited temperature range. Moreover, when multiple supercapacitors are combined, they require expensive balancing circuits that add expense and draw additional and greater current to further shorten battery life.