Lithium-ion batteries have the highest energy efficiency, the longest charging cycle runtime, and the longest life span of all rechargeable batteries. They are reliable under a large array of conditions, and delivery an outstanding capacity-to-weight-ratio.

All Moonlight headlamps have replaceable batteries, be it the internal battery cells of the Noctia system, or the external battery hard case of the Bright As Day collection.

Battery capacity can be measured in watt-hours (Wh), indicating how many watts the battery can deliver over the course of an hour before being discharged.

The Noctia headlamp systems feature internal lithium-ion batteries of type 18350 (18 x 35 mm) and 18650 (18 x 65 mm) with capacities of 5.2 Wh and 12.6 Wh. This gives a charging cycle runtime of 1h 10min on the Noctia, and almost 3 hours on the Noctia Max on full power - 500 lumens!

The Bright As Day series feature external batteries of 17 Wh, 36 Wh, and 71 Wh. These batteries have one, two, and four 21700 (21 x 70 mm) battery cells accordingly. The Bright As Day 800, 1300(S), and 2000 are equipped with the 17 or 36 Wh batteries running on 3.7 volts, while the Bright As Day 3000 and 4000 are compatible with the 71 Wh battery running on 14.8 volts.

One of the key unique features of a Moonlight headlamp is its ability to deliver true and constant light output throughout the entire battery charging cycle life. The only way to achieve this is to ensure the battery is of high quality and able to deliver enough power throughout the charging cycle. This is why we only deliver some of the best batteries in the industry.

When connecting the battery or powering on the headlamp, an indication of remaining battery charging cycle life is given in the form of a light code:

• Constant blue (Green on Noctia): >80%
• Blinking blue/green: 50 - 80%
• Constant red: 25 - 50%
• Blinking red: <25%

When the battery life drops below 10%, the headlamp will blink and go into reserve mode - allowing only the two lowest brightness settings (5% and 25%) to provide enough light to get safely back home.

Your charging and storing routines have an impact on the battery's life and durability.

The batteries should not be charged unattended overnight, and the charging cable should not be connected longer than necessary. Disconnect the charging cable when the battery is finished charging.

To optimize battery longevity with day-to-day use, charge the battery to 80% only; a lithium-ion battery performs best over time if you avoid repeatedly fully charging it. For shorter outings and daily domestic use in the dark season, charging it to 80% should be sufficient, and will keep your battery healthy and happy for longer!

For longer outings and adventures, it is of course recommended to charge the battery up to its full 100% potential.

Always disconnect the battery when the headlamp is not in use! Leaving the headlamp connected will drain and wear on the battery. The lamp can also accidentally power on in your backpack if left connected. For the Noctia, this is best done by inserting the battery wrong way in.

For long time storage, keep the battery level at 50 - 80% for best performance and longevity. When storing the headlamp over summer or longer periods of months, it is encouraged to use the headlamp and charge the battery once to maintain battery longevity.

All our batteries are equipped with faulty discharge protection. This helps the battery perform over time, and prevents damage from faulty discharges.

Lithium-ion batteries will eventually lose some of their capacity over time. We guarantee a minimum of 500 charging cycles, although we experience that most batteries will last even longer.