Is there a Body Battery on Apple Watch?

What Garmin’s Body Battery is

Garmin says its watches look at your heart rate variability, stress level, sleep quality and activity to work out a Body Battery level from 5 to 100. Garmin compares it to a fuel gauge:

5 to 25: very low reserve energy
26 to 50: low reserve energy
51 to 75: medium reserve energy
76 to 100: high reserve energy

Garmin says good sleep charges it, and hard activity and high stress drain it faster. It is meant to go down through the day and recharge overnight, and Garmin advises wearing the watch to sleep for more accurate results.

What Apple Watch has instead

Apple’s Readiness app gives a score from 0 to 10 for how ready you seem for the day, built from recent activity and training load, overnight vitals such as heart rate variability (HRV), and your recent sleep score. It runs on Apple Watch Series 12 and Apple Watch Ultra 4 only. Here’s which Apple Watches get a readiness score.

Readiness is not the same as Body Battery. Garmin’s number rises and falls through the day as an energy reserve; Apple’s is a guide to whether to push or rest. Apple says the score can update through the day as new data comes in.

Can I get a Body Battery-style score on an older Apple Watch?

Not from Apple. Series 11, Series 10, Series 9, Apple Watch SE and Ultra 3 or earlier don’t get the Readiness app, even on watchOS 27. An iPhone app that reads Apple Health can give you a daily score from your watch’s data instead. Bevel, for example, has an Energy Bank score in its free plan. That’s Bevel’s own score, so its numbers won’t match a Garmin watch.

Training Readiness vs Body Battery

Garmin has a second score, Training Readiness, on some of its watches. Body Battery is about your energy through the day; Training Readiness is about how ready you are for training that day. On Apple Watch, Apple’s Readiness score is closer to Training Readiness than to Body Battery.

In Vital

Vital gives you a readiness score each morning that leads with your body: HRV, resting heart rate, breathing rate, blood oxygen and, from a watch that records it, sleeping wrist temperature, with yesterday’s water, drinks, daylight and steps able to nudge it a little. Vital works with or without an Apple Watch; on a night with no heart reading, it gives an estimate and marks it as one. Vital does not use Apple’s or Garmin’s formula. Vital is not a medical device.

Get Vital for iPhone

Common questions

Does Apple Watch have Body Battery?

No. Body Battery is Garmin’s feature. Apple’s Readiness score on Series 12 and Ultra 4 is the closest Apple feature, and it works differently.

Is there a free Body Battery app for Apple Watch?

Bevel is one iPhone app that reads Apple Health and has a daily energy score in its free plan, called Energy Bank. It’s Bevel’s own score, so it won’t match a Garmin number.

Does Body Battery work on an Apple Watch SE or Series 11?

No. Body Battery only runs on Garmin devices. Apple’s Readiness app is on Series 12 and Ultra 4 only, so on an SE or Series 11 you’d need an iPhone app that reads Apple Health.

What is a good Body Battery level?

Garmin calls 76 to 100 high reserve energy and 5 to 25 very low. It is meant to drop during the day, so a lower evening number is normal.

Vital gives general information about fitness and wellbeing. It is not medical advice, and it does not diagnose or treat any condition.