Garmin announced the Enduro 4 today, and the device feels vastly familiar to the Enduro 3.

Like its predecessor, the Enduro 3 has the longest-lasting GPS watch with solar charging in the Garmin lineup. A bonkers, 320 hours in activity mode and up to 90 days in smartwatch mode, on a 1.4″ MIP display with a solar lens.

The Enduro 4’s battery headline is a repeat on paper too, so what is the real change here? It is whats built around the battery.

What’s Actually New

Let’s break it down.

Power Modes. Preset configurations let you pick between Max Accuracy, full-feature tracking for shorter efforts, and Max Battery, built for the long haul. If you’ve ever stood in a start corral doing battery math, this is for you.

Grade-Adjusted Pacing. Pace-based workout targets and a rolling pace that account for hills. On trail and mountain terrain, flat-pace numbers lie to you. Now your targets and real-time pace can adjust for the climb.

Stamina Zones and Stamina Curve. Zones show how your stamina shaped an activity, and the curve tracks how your endurance changes over time based on your fitness and training history. Interesting for pacing a 50K or 100K. We want to see how it holds up on real long days before we call it a game changer.

Faster Maps. 50% more RAM than the Enduro 3, an updated map engine, 30% faster panning and a Perspective view that shows more detail close up and further out. Routable maps are built in.

Garmin Epic. Group activities across days, weeks or months into one story in Garmin Connect, with photos and aggregated health and performance data. Handy for stage races, thru-hikes and multiday adventures.

Smaller Upgrades. Rowing gets VO2 max and a power curve for indoor sessions. Rucking lets you adjust pack weight mid-activity and set targets like calories burned.

Not Much Changes on the Hardware

Like we said, the looks are mostly familiar, with a few tweaks.

The Enduro 4 keeps the 51mm case, Power Sapphire lens, titanium bezel and fiber-reinforced polymer case, plus the white and red LED flashlight and 10 ATM water resistance. It weighs 66 grams whereas the Enduro 3 weighed 63 grams, so you’re carrying 3 grams more. Big deal.

Two changes stand out. The new ComfortFit Fabric Band is moisture-wicking and works with QuickFit for easy swaps and the memory jumps to 64 GB, where the Enduro 3 had 32 GB. A pretty sizable shift for even more maps and music for day long efforts.

What It’s Taking Over

The Enduro 4 steps in as the next-generation Enduro, and it keeps the same $900 price. Garmin’s release doesn’t say what happens to the Enduro 3, so we’ll watch for whether it sticks around at a lower price which could be a great deal. If it does, that’s the value play for anyone who only cares about battery.

Why Enduro Over Another Garmin

Long distance and multi-day adventures are flaming hot right now, so pick the Enduro 4 if your training and racing looks something like this.

You race or train for many hours at a time are into ultras, multi-day efforts and big mountain days. You hate charging your watch. You like having stamina and grade data on long efforts. These features are aimed at trail and ultra athletes.

Skip it if you want an AMOLED display, a smaller case, or a watch built mainly for road racing and everyday wear. Garmin’s other lines, like Forerunner and Fenix, may be a better fit.

If you want light, tough and rugged, at 66 grams, it’s not a heavy brick for a watch this size.

The Enduro 4 is available to order on October 9 for $899.99 on Garmin.com.