HLB2500 - All-Weather Battery Pack (2,500mAh)

The all-weather cell that keeps your headlamp running where ordinary batteries quit Full power at -40°C, sealed to IPX8, and ready at 10,000m. Built for the HA29 UHE and HA27 UHE. 2,500mAh / 9.5Wh rechargeable Li-ion pack Holds over 80% of its capacity at -40°C (-40°F) Rated for altitudes up to 10,000m IPX8 waterproof, sealed against snow and immersion Recharges over its own USB-C port, no charger needed Red and green indicator shows charge status at a glance ≥500 recharge cycles at room temperature Direct fit for the Nitecore HA29 UHE and HA27 UHE One battery for the whole trip, in any weather High altitude, extreme cold and heavy weather covered. The HLB2500 is a purpose-built pack for the HA29 UHE and HA27 UHE, so the light you rely on keeps its output when the conditions turn against you. Alkaline and standard lithium cells fade fast in the cold and lose reach at altitude. This pack is engineered to keep delivering, from a snowbound treeline to a high summit push. Steady power at -40°C Reliable light in deep cold. A conventional Li-ion cell can drop to 10% of its usable capacity or less in extreme cold. The HLB2500 keeps over 80%, so your headlamp stays bright through a long freezing night. Paired with the HA29 UHE, the HIGH level holds around 400 lumens in the -40°C to -30°C range. That is the difference between a working light and a dead one on a winter ridge. Ready at 10,000m Fearless in thin, low-pressure air. The HLB2500 delivers stable power at altitudes up to 10,000m, so it keeps working through the summit push where the air, and lesser batteries, run out. Sealed to IPX8 At home in snow, rain and immersion. The pack is built to shrug off sudden weather, from a torrential downpour to a driving blizzard, and carries an IPX8 waterproof rating so a soaking on the trail is a non-event. Recharge anywhere over USB-C Charge it straight from the pack. The built-in USB-C port tops the HLB2500 up from any USB-C source, so a power bank or a car socket at the trailhead is all you need. No dedicated charger to pack. A colour indicator keeps you informed: red constant-on while it charges, green constant-on when it is full. Pre-charge a spare before you leave and you always know exactly what you are carrying. Protected from the inside out Multiple safeguards on every charge. A high-quality protection IC and high-power MOS-FET regulation guard against overcharge, over-discharge and short circuits, with separator thermal shutdown protection as an added layer. Built to take a knock Rugged where it counts. A high-strength plastic housing lowers the risk of impact-induced short circuits, while an integrated high-strength potting design protects both the cell and the circuit board. Nickel-plated copper contacts at both ends add impact and oxidation resistance, keeping a clean connection to your headlamp trip after trip. Cleaner power, season after season Rechargeable and responsibly made. One HLB2500 replaces a long trail of single-use cells. It is mercury free, lead free and cadmium free, and holds multiple global certifications. HLB2500 VS A STANDARD HEADLAMP BATTERY Power that survives the cold Standard Li-ion cells can fall to 10% usable capacity or less at -40°C. The HLB2500 keeps over 80%. Sealed, not splash-resistant Many packs manage only light splashes. The HLB2500 is rated IPX8, so it handles rain, snow and immersion. Recharge straight from the pack Its own USB-C port tops it up from any USB source, so there is one less item to carry and lose. Hundreds of trips per pack ≥500 recharge cycles at room temperature and ≥300 at -40°C, in place of a steady stream of disposables. WHO IT IS FOR High-Altitude Mountaineering Stable power at up to 10,000m keeps your headlamp working through an alpine summit push. Snow Sports & Winter Hiking Holds output in freezing air and shrugs off snow, so early starts and late finishes stay lit. Cold-Climate Expeditions Over 80% capacity retained at -40°C, with layered protection for demanding, remote work. A Charged Spare HA29 UHE or HA27 UHE owners can carry a pre-charged pack and hot-swap in seconds. PERFORMANCE & CONDITIONS Operating temperature Down to -40°C (-40°F) Capacity retained at -40°C ≥80% Output with HA29 UHE (HIGH, -40°C to -30°C) Approx. 400 lumens Altitude rating Up to 10,000m Waterproof rating IPX8 Cycle life (room temperature) ≥500 charge / discharge cycles Cycle life (-40°C) ≥300 charge / discharge cycles Compatible headlamps Nitecore HA29 UHE, HA27 UHE TECHNICAL SPECIFICATIONS Capacity 2,500mAh Nominal voltage 3.8V Energy 9.5Wh Battery type Rechargeable Li-ion Charging port USB-C Charging input 5V⎓1.5A Charge indicator Red: charging / Green: fully charged Protection Overcharge, over-discharge, short-circuit, separator thermal shutdown Materials Mercury free, lead free, cadmium free Dimensions 62.0 x 38.5 x 16.4mm (2.44 x 1.52 x 0.65") Weight 51g (1.80 oz) FREQUENTLY ASKED QUESTIONS Which headlamps does the HLB2500 work with? The HLB2500 is a direct-fit rechargeable pack for the Nitecore HA29 UHE and HA27 UHE. It drops straight in as your main cell, and because it is a self-contained pack you can carry a charged spare and swap it in the field in seconds. Can I charge it on its own, and how do I know when it is full? Yes. The USB-C port is on the pack itself, so it charges from any USB-C source at 5V/1.5A with no headlamp and no dedicated charger needed. The indicator glows red constant-on while charging and green constant-on once full, so a spare is easy to prepare before a trip. How should I look after it between trips? Store it partially charged in a cool, dry place. Built-in over-discharge protection looks after a resting cell, and with ≥500 recharge cycles at room temperature a single pack lasts many seasons of regular use. What's In The Box 1x Nitecore HLB2500 All-Weather Battery Pack Keep your headlamp running in the worst weather on the mountain GET YOUR HLB2500 NOW