Zepp app 10.4.0 is rolling out with one of the more meaningful Amazfit app updates in recent months, replacing BioCharge with a new readiness feature called HybridCharge and adding LifeLoad logs, Training Focus insights, and HYROX-specific training tools. The update is available on iOS now and is also listed with new HYROX Race Analysis features in the App Store release notes, while broader rollout timing can still vary by platform and region. [web:28][web:39][web:30]
For Amazfit users, this is more than a simple rename. Zepp is shifting from a recovery score based mainly on watch data to a broader system that also considers how you actually feel, which should make the app’s guidance more useful for people balancing training, work stress, poor sleep, soreness, and everyday life. [web:28][web:29][web:30]
Zepp app 10.4.0 introduces HybridCharge as part of a broader recovery and training update.
HybridCharge replaces BioCharge
For a long time, the Zepp app used BioCharge as a daily readiness-style score built from metrics such as sleep, heart rate, activity, and recovery. In version 10.4.0, that system is being replaced by HybridCharge, which Zepp describes as a daily energy score that blends measured data with self-reported context. [web:28][web:30]
That shift matters because smartwatch data only tells part of the story. A wearable can detect bad sleep or rising strain, but it cannot always know whether you are ill, mentally drained, sore from a hard gym session, or feeling better than the raw numbers suggest. [web:29][web:30][web:32]
LifeLoad adds context
The biggest practical change is the arrival of LifeLoad logs. This feature lets users record factors such as fatigue, sickness, muscle soreness, joint pain, energy levels, and other day-to-day influences, with each one marked by impact level rather than being left out of the picture completely. [web:28][web:29][web:30]
That makes HybridCharge more interesting than a simple rebrand. Instead of relying only on sensors, Zepp is trying to combine objective data with subjective feedback, which is closer to how serious training platforms attempt to understand readiness in the real world. [web:28][web:29][web:32]
LifeLoad and Training Focus are designed to give Zepp users more context than a single daily score.
Training Focus looks back further
Zepp has also added Training Focus, a feature that reviews the previous seven days of exercise and compares your mix of strength and endurance work. That gives users a clearer sense of whether training has become too one-sided, rather than only showing a single readiness number for the current day. [web:28][web:30]
For runners, gym users, and hybrid athletes, that may end up being one of the most useful parts of the update. Weekly balance is often more actionable than a standalone recovery score, especially for people who mix cardio, strength work, and event-specific sessions across the same training block. [web:28][web:30]
HYROX support gets a boost
The update also adds a HYROX Training Library and HYROX Race Analysis, expanding Amazfit’s push into the growing hybrid fitness scene. That lines up with Amazfit’s official HYROX partnership, which Zepp Health announced as part of its strategy to support training, racing, and recovery for that audience. [web:28][web:31][web:39]
This is the part of the release that feels especially strategic. Recovery scoring is useful, but structured workouts and race review tools give users a stronger reason to keep opening the app between sessions rather than only checking it after a workout or first thing in the morning. [web:28][web:31]
Zepp app 10.4.0 adds HYROX-focused tools as Amazfit deepens its partnership with the sport.
Rollout still looks staggered
The rollout does not appear to be fully synchronized yet. Reports indicate that the Zepp phone app now shows HybridCharge, while some Amazfit watches still display the older BioCharge branding until later updates bring everything into line. [web:28][web:30]
That means users may see different names on the app and on the watch for a while. If the new features are missing altogether, platform timing is the most likely explanation, especially since some users reported iOS getting the update before Android and staged releases remain common for large app changes. [web:27][web:32][web:39]
What this means for Amazfit users
For people who already pay attention to readiness, recovery, and training trends, Zepp app 10.4.0 looks like a meaningful improvement rather than a cosmetic refresh. HybridCharge should be more useful than BioCharge if users actually engage with the new LifeLoad inputs, while Training Focus and the HYROX tools give the update more depth than a simple score rename. [web:28][web:29][web:30]
The bigger test is whether users keep logging their daily condition after the novelty wears off. If they do, Zepp may have taken a real step toward making the app feel like a practical training companion instead of just a dashboard for graphs and scores. [web:30][web:32]
FAQs
Is HybridCharge just BioCharge with a new name?
No. Zepp has replaced BioCharge with HybridCharge and broadened the system by combining watch data with self-reported wellbeing inputs through features such as LifeLoad. [web:28][web:29][web:30]
What is LifeLoad in the Zepp app?
LifeLoad is a logging feature that lets users record factors such as fatigue, sickness, soreness, and energy levels, each with an impact level that can feed into HybridCharge. [web:28][web:29][web:30]
What does Training Focus do?
Training Focus reviews the previous week of exercise and compares your balance of endurance and strength work. [web:28][web:30]
Does Zepp app 10.4.0 include HYROX features?
Yes. The update adds a HYROX Training Library and HYROX Race Analysis, and those tools align with Amazfit’s official HYROX partnership. [web:28][web:31][web:39]
Why does my watch still say BioCharge?
Because the rollout appears to be staged. The Zepp app may show HybridCharge before your watch firmware or on-device labels are updated. [web:28][web:30]