Duracell Ultra AAAA LR61 Alkaline Batteries - 2 Pack

The Duracell Ultra AAAA LR61 is a 1.5V alkaline battery supplied in a 2-pack, designed for compact electronic devices that require the slim AAAA cell format. Common applications include active stylus pens for tablets, laser pointers, glucose monitors, digital voice recorders and small medical equipment where the reduced diameter of the AAAA cell allows for thinner device profiles than standard AAA batteries can achieve.

AAAA cells measure approximately 8.3mm in diameter and 42.5mm in length, making them roughly half the diameter of an AAA battery. This size is less common than AA or AAA, but remains the standard power source for Microsoft Surface pens, Wacom styluses, and similar active input devices. The alkaline chemistry provides stable voltage output across the discharge curve, which matters for devices with voltage-sensitive electronics such as precision stylus tips and medical sensors.

Duracell rates these batteries for long shelf life when stored at room temperature, typically retaining usable capacity for several years in unopened packaging. The 2-pack format suits users replacing batteries in a single device rather than stocking bulk quantities. Each battery weighs approximately 6-7 grams and delivers around 550-625mAh capacity depending on discharge rate, sufficient for weeks or months of typical stylus pen use.

The AAAA format is not interchangeable with AAA batteries despite the similar naming. Devices designed for AAAA cells have battery compartments sized specifically for the narrower diameter and will not accept AAA batteries. Conversely, AAAA batteries are too narrow to make proper contact in AAA-sized compartments.

What devices use AAAA batteries?

AAAA batteries power active stylus pens such as Microsoft Surface pens and Wacom styluses, laser pointers, glucose monitors, digital voice recorders and some compact medical devices. The slim 8.3mm diameter allows for thinner device profiles than AAA batteries.

Can I use AAA batteries instead of AAAA?

No. AAAA cells are approximately half the diameter of AAA batteries. Devices designed for AAAA have battery compartments sized for the narrower cell and will not accept AAA batteries. The formats are not interchangeable.

How long do AAAA batteries last in a stylus pen?

In typical stylus pen use (drawing, note-taking for several hours per week), a single AAAA battery lasts several weeks to a few months. Active use with pressure-sensitive features drains the battery faster than passive use as a basic pointer.

What is the shelf life of these batteries?

Duracell alkaline batteries retain usable capacity for several years when stored unopened at room temperature. The exact shelf life depends on storage conditions, but properly stored batteries typically remain viable for 5-10 years from manufacture date.