The quick answer
Our pick
COROS PACE 4
The one to buy
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The PACE 4 looked like a cosmetic job: the PACE 3 with a brighter screen and a third button. Bright screens usually eat batteries. So the sensible fear was a prettier watch that dies sooner. COROS's own battery page says the opposite. With both GPS bands listening, its most precise way of tracking, COROS rates the PACE 4 for 31 hours, or 24 with the screen always on. It rates the PACE 3 for 15, and that screen is always on. Nobody has run either watch flat in that mode, but the gap on paper is wide. Testers found the PACE 4's tracks among the cleanest they've recorded. And since a firmware update on September 26, 2026, it carries real topo maps the PACE 3 never got. Milewright's call: buy the COROS PACE 4. It sits one price band up, and it's worth the step. That call is for a runner who is weighing these two COROS watches and can stretch to that band. If your budget stops below it, our budget running watch guide sets out what each price band gives up.
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The PACE 3 still suits one runner. They want the screen showing all day, sharp in summer sun, with two weeks between charges. They never need a map or more than 15 hours of dual-band tracking. If you already own one, keep it. COROS is still updating it three years on. Nothing the PACE 4 adds changes a road runner's ordinary week. Upgrade if you enter a race longer than 15 hours of dual-band will cover, or you want a map at a trail junction. Upgrade, too, if your battery starts fading after the two-year warranty runs out.
COROS PACE 4: a bigger rated race battery, and maps by firmware
Price band: under $250
COROS's battery page rates the PACE 4 for 31 hours tracking both GPS bands. With every satellite system on, it's 41. Everyday wear is 19 days. Add a 1.2-inch AMOLED screen at 1,500 nits and free training plans with no subscription. The same page sets the always-on cost of every mode beside the headline. I spent a working life reading supplier data sheets, and I like one that admits its own worst case. I'd still want its GPS hours run to empty, and nobody has done that yet.
Nobody has run one flat in dual-band, so its race battery is a projection, not a finish line. DC Rainmaker saw it burn about 4% of its charge an hour while tracking both bands, its display lit the whole time. That pace projects to about 25 hours, close to COROS's own always-on figure in the table below. At that rate, a marathon in the most accurate mode leaves most of the battery for the drive home. A first 50K looks comfortable. The tracks earn the battery, too. Downtown, under trees and through two big-city marathons, testers found it as clean as Garmin's flagship. Our GPS battery planner does the sums for a longer day.
Maps are the newer story. At launch it navigated by breadcrumb only, which is why most reviews still say "no maps". Firmware V3.2008.0 on September 26, 2026 added global landscape and topo maps. They're the same non-routable maps as the pricier PACE Pro. But they squeeze into 4 GB of storage, which DC Rainmaker found more than half full before he'd downloaded anything. Think a county, not a state. The questions page on COROS's own site hasn't caught up and still tells shoppers the watch lacks full mapping. It's a rare case of a maker underselling its own product.
The catch is daily battery with the screen always on. The PACE 3's MIP screen shows the time all day for free. The AMOLED makes you pay. COROS says 6 days always-on, and testers running daily got 4–5. Let it wake when you lift your wrist and owners report 10–14 days. If you want the time on show without charging every weekend, you'll notice. Our AMOLED vs MIP guide weighs that trade.
We'd buy it. It does everything the PACE 3 does, with a map. Even with its screen left on, COROS rates its dual-band race battery well clear of the PACE 3's 15 hours.
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COROS PACE 3: keep yours, don't buy one new
COROS claims 15 hours of dual-frequency GPS, 25 with all systems and 38 on plain GPS. Daily wear is 15 days, with the MIP screen always on. Every independent test behind it dates from 2023. Back then DC Rainmaker found it the most accurate COROS yet, with its best showing in his high-rise downtown test. COROS's launch figure for daily wear was higher than today's. After a February 2024 update, COROS cut its own daily estimate by more than a third. Nobody has independently run one down, in daily wear or in any GPS mode. The 15 hours is COROS's word, and today's watch isn't the one the labs tested.
Credit where it's due: COROS keeps feeding it. Phone music controls came in December 2025, and Hybrid Fitness mode for HYROX-style sessions in March 2026. The September 26 update that gave the PACE 4 maps gave the PACE 3 a passcode lock. That's how you want a maker to behave after the warranty ends. For someone buying today, though, it's a lower rated race battery and no map. COROS rates it at 15 hours of dual-band, against 24 for the PACE 4 with its screen always on. We'd pass on buying one new.
What happened to the PACE 3 in the May 2026 bricking?
Watches died days or weeks after the mid-May 2026 firmware update. COROS said it mostly hit 2–4 year old models. The PACE 3 was hit hardest, because it sells the most. Owners' first answer from support was an automated reply proposing money off a replacement they'd pay for. That's a bold response to a watch your own update killed. After weeks of owner anger, COROS's head of support confirmed on June 17, 2026 that COROS replaces any watch that died after the update. COROS says nearly every update installs cleanly. DC Rainmaker found part of the online pile-on came from fake accounts. It ended fairly, just slowly. If your PACE 3 died after that update, ask COROS to honor those June 17 terms. A working PACE 3 isn't worth retiring over this. But it's one more reason a new buyer should take the PACE 4.
Should a PACE 3 owner upgrade?
Not for heart rate. The tester who checked both against a chest strap found the PACE 4's newer sensor read much like the PACE 3 on his wrist. Owners of both still wear a strap on cold days and intervals. Not for the screen either, unless you train under dim indoor light, where owners find the MIP hard to read. Upgrade for the long day or the map. Watch your battery, too. A couple of owners report a PACE 3 battery fading within two years. One saw both the original and its refurbished replacement fail. Out of warranty, support then quoted for a paid repair. A launch-day owner reports no trouble in more than three years. That's anecdote, not a failure rate. Still, if your charging gap has shrunk and the warranty's gone, put the repair money toward a PACE 4. Until then, keep it.
Battery in every GPS mode, claimed beside measured
| Mode | PACE 3, COROS claims | PACE 3, measured | PACE 4, COROS claims | PACE 4, measured |
|---|---|---|---|---|
| Dual-frequency (most accurate) | 15 h, screen always on | Not independently tested | 31 h (24 h always-on) | About 4% an hour, always-on; not run to empty |
| All systems | 25 h | Not independently tested | 41 h (30 h always-on) | Not tested |
| Plain GPS | 38 h | Not independently tested | Not listed | Not tested |
| Daily wear | 15 days, screen always on | Not independently tested; COROS's launch claim was higher than today's | 19 days; 6 days always-on | 4–5 days always-on, running daily; 10–14 days on raise-to-wake |
What changed between the PACE 3 and the PACE 4
| PACE 3 | PACE 4 | |
|---|---|---|
| Screen | 1.2 in MIP, always on | 1.2 in AMOLED, 1,500 nits |
| Buttons | Dial and back/lap | Dial, back/lap and Action |
| Microphone | No | Yes, for voice notes and control |
| Maps | Breadcrumbs only | Topo maps since September 26, 2026 |
| Hybrid Fitness mode | Yes, since March 2026 | Yes, since March 2026 |
| Latest firmware | V3.2008.0, September 2026 | V3.2008.0, September 2026 |
| Newest independent tests | 2023 | 2025–2026 |
| May 2026 bricking | Most-hit model | Mostly older models hit |
The one to buy: COROS PACE 4
The one to buy
The PACE 4 is the rare sequel that took the brighter screen and still came back rated for more race battery, even with that screen left on. Then it picked up maps for free ten months later. Buy the PACE 4. Tempted by Garmin instead? Our COROS vs Garmin comparison sets the price-matched pairs side by side. If you already wear a PACE 3, keep it until it can't do the day you've planned. Then this is where to go.
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The evidence in full
Research count for this page: 2 models weighed; 0 maker manuals among them; across this site's research, 367 sources kept in full; 148 Reddit threads read, kept as the reader's summary, not in full.
PACE 4, by source
| Source | What they did | What they found |
|---|---|---|
| COROS battery page | Maker figures per mode | 31 h dual-frequency (24 h always-on), 41 h all systems (30 h always-on), 19 days daily (6 days always-on) |
| DC Rainmaker (Nov 2025) | Side-by-side tracks, chest strap | GPS very good on road, trail and city; about 4% an hour in Max GPS with always-on, a pace over part of a charge rather than a run to empty; about 6 days always-on with an hour of GPS a day; HR good on runs, struggled at quick stop-starts on outdoor rides; open water acceptable, cut one corner |
| DC Rainmaker (Sep 2026) | Maps beta | Maps work but rotate slowly on beta firmware; 4 GB storage, much of it used by system files on his watch |
| Tom's Guide (Nov 2025) | Against FR970, Vertical 2, chest strap | GPS excellent; HR close to chest strap with spikes at starts and after pauses; 4–5 days always-on running daily |
| The Run Testers (six months) | Long-term, races incl. Paris Half and London Marathon | GPS close to flawless against FR970; about 5 days always-on; buttons slightly less responsive after six months; dial pressed by the wrist bone |
| The Quantified Scientist (Mar 2026) | Polar H10 reference, winter | GPS among his best results on repeated loops; running HR poor, suspected cadence lock; indoor cycling 0.97 correlation; strength poor; sleep stages poor; HR "super close" to his earlier PACE 3 result |
| TechRadar (Feb 2026) | Experience, one reference watch | 10–14 days with a few workouts a week; distance check against one Huawei watch is a weak method |
| Owners (Reddit) | Daily use | One reports 12 days between charges; band keeper comes loose; an indoor-only runner's VO2 Max and Running Fitness stayed blank after months; two tattooed owners report usable HR |
PACE 3, by source
| Source | What they did | What they found |
|---|---|---|
| COROS battery page | Maker figures per mode | 15 h dual-frequency, 25 h all systems, 38 h GPS, 15 days daily with sleep tracking and stress |
| DC Rainmaker (fall 2023, launch firmware) | Bought his own unit; side-by-side tracks in forest, among downtown high-rises, on a long mountain hike and on bike rides | Clean tracks in the forest, on the mountain hike and between high-rises; open water strayed in one section; wrist HR often matched the chest strap but was wrong for long stretches of a long run and a steady forest run; elevation read slightly high on most activities; quoted COROS's higher launch figure for daily battery |
| COROS release notes | Firmware history | Phone media controls V3.1308.0 (Dec 15, 2025); elevation fixes Aug 2025 and May 2026; V3.2008.0 Sep 26, 2026 |
| Owners (Reddit) | Daily use | MIP praised outdoors, one returned it as unreadable indoors; battery decline reported by two owners, trouble-free for others |
Disagreements that don't change the call
- PACE 4 running HR: good for DC Rainmaker, Tom's Guide and The Run Testers, poor for The Quantified Scientist in winter. Temperature, fit and individual wrists are the likely explanation; open.
- PACE 4 maps: Tom's Guide (Nov 2025), TechRadar (Feb 2026), The Run Testers (May 2026) and the coros.com FAQ say no maps; the user guide and September 2026 release notes say global landscape and topo maps. The firmware date explains it; the FAQ is stale.
- PACE 4 dual-band battery quoted as 41 h in some reviews: that's the all-systems figure. Dual-frequency is 31 h, or 24 h with the screen always on.
- Comparing the two watches' race battery: the PACE 3's MIP screen is always on, so its 15 h dual-frequency claim sits closest to the PACE 4's 24 h always-on figure, not its 31 h.
- PACE 3 lens: COROS says mineral glass; DC Rainmaker's PACE 4 review says the PACE 4 moved to mineral glass "from plastic". Minor, open.
- PACE 3 daily battery: the launch claim was higher than today's 15 days; COROS says its February 2024 update to heart rate and GPS firmware lowered the estimate. Explained.
- PACE 3 ANT+: the coros.com spec table shows ANT+, but that table carries PACE 2 placeholders. The PACE 3 pairs Bluetooth sensors only; COROS doesn't state ANT+ for the PACE 4 either.
- PACE 4 identity: COROS holds two FCC IDs named PACE 4, W336 (on US listings) and W335 (no US listing seen); the filings don't say how they differ.
Trust record
- 2025 Bluetooth and account flaws were found on a PACE 3 and fixed in July 2025 firmware, before the PACE 4 launched; COROS's statement tells owners to update to the latest firmware.
- No CPSC recall for any COROS product.
- Both watches carry a two-year warranty from activation; COROS covers Amazon purchases only from its official Amazon store.
Sources
- COROS: Battery Specifications (opens in a new tab)
- COROS: PACE 4 Release Notes (opens in a new tab)
- COROS: PACE 3 Release Notes (opens in a new tab)
- COROS: PACE 4 product page (opens in a new tab)
- COROS: PACE 4 FAQ (opens in a new tab)
- COROS: PACE 3 product page (opens in a new tab)
- COROS: Set Up Your COROS PACE 4 (user guide) (opens in a new tab)
- COROS: Operate the COROS PACE 3 watch (user guide) (opens in a new tab)
- COROS: March 2026 feature news (opens in a new tab)
- COROS: Watch warranty (opens in a new tab)
- COROS: Bluetooth Security Vulnerability Statement (opens in a new tab)
- CPSC recall database: COROS (opens in a new tab)
- DC Rainmaker: COROS PACE 4 in-depth review (opens in a new tab)
- DC Rainmaker: COROS PACE 3 in-depth review (opens in a new tab)
- DC Rainmaker: mapping watches, September 2026 (opens in a new tab)
- DC Rainmaker: COROS bricking, latest updates (opens in a new tab)
- Tom's Guide: COROS PACE 4 review (opens in a new tab)
- TechRadar: COROS PACE 4 review (opens in a new tab)
- The Run Testers: COROS PACE 4 six-month review (opens in a new tab)
- The Quantified Scientist: COROS PACE 4 (opens in a new tab)
- r/Coros: PACE 3 vs PACE 4 (opens in a new tab)
- r/Coros: PACE 4 owners and switchers (opens in a new tab)
- r/Coros: PACE 3 battery failure (opens in a new tab)
