Let me start by saying I was skeptical about rechargeable AAAA batteries—until I tried this EBL kit. As someone who uses a Surface Pen daily, the constant battery swaps were driving me nuts. This little duo (2 batteries + USB charger) has been a game-changer.

The first thing that impressed me? The charger’s USB design. I can juice it up using my laptop’s port or even a power bank during travel—no hunting for outlets. Though fair warning: inserting the battery feels like solving a tiny puzzle at first (that corrugated positive contact had me tilting it like a pro bartender pouring whiskey). Once you get the angle right, it clicks into place.

Performance-wise, these hold up surprisingly well. My stylus used to ghost on me mid-meeting with disposables, but these deliver steady voltage—no more awkward ‘hold on, my pen died’ moments. The 400mAh capacity lasts about 3 weeks with heavy note-taking, and having a spare pre-charged means zero downtime.

Eco-win alert: I’ve saved at least 8 disposable batteries in two months. The charger’s auto-shoff feature gives peace of mind—I once forgot it plugged in overnight and woke up to a cool green light instead of a melted disaster.

Minor gripes? The charger could use spring-loaded contacts for easier insertion, and a travel pouch would’ve been nice (I repurposed an eyeglass case). But for under $15? This kit punches way above its weight. If your stylus is battery-hungry like mine, stop the disposable madness and grab this set.