The LongRun is not compatible with the Fenix 6 Series (or earlier Fenix models) and the Forerunner 970.

LongRun for Garmin Watch (Black, Left Charge - 9 o'clock charging port position when looking at the screen)

The only 19-gram power bank that clips to your watch strap and charges your Garmin mid-activity. No cables. No GPS interruption.
$69.90
$69.90
$79.90
Shipping calculated at checkout.
Out Of Stock

LongRun works with most Garmins with a side charging port: Fenix 7/7X/8, Forerunner 255/265/955/965, Epix Gen 2 + Pro, Instinct 2/2X/3, Tactix 7, Enduro 2. If your watch charges through the side of the case, LongRun fits.

  • Weight: 19g
  • Size: 1.3 x 1.3 x 0.7 Inch
  • Battery: 380 mAh Li-ion Polymer, rechargeable
  • Output: Up to 100%
  • Recharge LongRun Time Indicator: 4-stage LED power gauge on the side
  • Indicator: 4-stage LED power gauge on the side
  • Housing: Impact-resistant ABS shell
  • Connector: Garmin side-port magnetic dock
  • Waterproof Rating: IP67 (rain, sweat, river crossings, 1-meter submersion for 30 min)
  • Includes: LongRun unit + custom
    charging cable + Manual

LongRun fits most Garmin's with a side charging port.

  • Fenix Series: Fenix 7, 7S, 7X · Fenix 8 (all sizes)
    Forerunner Series: Forerunner 255, 255S · 265, 265S · 955 · 965
    Epix Series: Epix Gen 2 · Epix Pro (42mm, 47mm, 51mm)
    Instinct Series: Instinct 2, 2S, 2X · Instinct 3
    Tactical: Tactix 7 · Tactix 7 Pro · Tactix Delta
    Adventure: Enduro · Enduro 2 · MARQ Gen 2

Not sure if your model has a side port? Look at the right edge of your watch case. If you see two small metal contact points, LongRun fits.

Not compatible with Apple Watch, Fitbit, Samsung Galaxy Watch, or any Garmin that uses a clip-on rear charger.

First-time setup (30 seconds):

  1. Detach one side of your Garmin strap from the watch case.
  2. Slide LongRun onto the strap from the open end. Position it close to the watch case.
  3. Reattach the strap to your Garmin.
  4. Dock the LongRun connector into the side charging port. You'll feel it click.
  5. Start your activity. Long press and Your Garmin will show the charging icon.

Daily use: Once LongRun is mounted on the strap, you can leave it in place. Simply long-press to start or stop charging.

To recharge LongRun: Attached the included cable into the back of the unit. 50 minutes to full.

Shipping:

  • Same-day fulfillment on orders placed before 2pm ET
  • Delivery: 3 to 5 business days (US)

Returns:

  • 30-Day Endurance Guarantee on every LongRun
  • 1-year limited warranty against defects
  • We cover return shipping inside the US.
  • Email warranty@longrunpro.com to start a return.
Fast full charge
IP67 Water rating
1-Year Warranty
Patented
Lightweight (19g)
Ships Fast
Frequently Asked Questions

Questions & Answers

We've collated the most common queries from our user base.

LongRun is designed to work with most Garmin sport and outdoor models that charge via USB on the right or left side of the watch. If your Garmin uses a standard charging cable (not a proprietary cradle or dock), LongRun is likely compatible. Not sure? Just check the charging port - or reach out to our team and we’ll confirm for you.

Yes. That’s exactly what LongRun was designed for. Unlike bulky battery packs, LongRun integrates with your wrist strap, allowing you to power your watch while running, hiking, biking, or commuting - no need to stop or hold anything.

Not at all. LongRun weighs just 0.85 oz - about the same as two quarters, and was engineered to stay flush against your wrist. Most users report forgetting it’s even there.

LongRun delivers steady, efficient charging while you’re in motion — fast enough to offset drain and increase battery percentage, even during use. It’s also ideal for pre-run top-offs if you need a quick boost.

LongRun is fully waterproof and ruggedized for endurance athletes and adventurers. Whether it’s sweat, storms, or alpine grit, this charger is built to survive wherever you take it.

Yes. LongRun features a secure locking strap system that keeps it in place during sprints, climbs, and uneven trails. No slipping, shifting, or bouncing — just reliable power.

LongRun provides enough power to fully recharge most Garmin watches once.

During charging, Garmin pauses heart rate monitoring, this is standard Garmin behavior, not a LongRun limitation. GPS tracking continues uninterrupted throughout

We provide a proprietary 1-meter magnetic charging cable in the box. It snaps effortlessly onto the LongRun to top it up before your next big event. When you're out on the trail, the LongRun clips directly onto your Garmin - no cables required while moving.

We offer a 30-day risk-free guarantee. If LongRun doesn’t perform the way you need it to, just send it back - no questions asked. Your trust matters more than a transaction.