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Fitbit Charge 5 troubleshooting

Fitbit Charge 5 (FB421): battery and water (from Android Authority and Trusted Reviews); display and sensors; identification; charging; sensors; battery and care, and a fix for each symptom below.

Battery and water (from Android Authority and Trusted Reviews)
Rated up to 7 days, about 5 with regular GPS use and about 3 with the always-on display, and safe to submerge to 50 meters.

Not chargingBattery drainPairingNot syncingNotificationsHeart rate

Part of Fitbit wearable model troubleshooting

Reviewed records

2 exact answers

Diagnose the exact device problem

Fitbit · not charging

Fitbit Charge 5 will not charge

Open record Fitbit · pairing

Fitbit Charge 5 will not pair with the phone

Open record

Confirm the model first

Which units this covers, and how to tell yours is one of them

Model numbers and patterns: FB421

Published specification

What is true of this model and changes how you fix it

Model — Charge 5 (advanced tracker)
A slim fitness band with built-in GPS, ECG, EDA stress sensing and continuous heart rate — but no physical button (touch-only, unlike the Charge 6), no Google apps, no microphone/speaker, no cellular.
No cellular / no on-band calls
Shows phone notifications; no speaker/mic or cellular, so those symptoms do not apply.
Touch controls
Its touch-only interface (no side button) can feel unresponsive with wet or gloved fingers or a screen film — that is the touch design, not necessarily a fault.
Display and sensors
A 1.04-inch AMOLED screen with a 3-axis accelerometer, optical heart-rate monitor, Pulse Ox and GPS. Fitbit dropped the clip-style charger used on the Charge 4.
Identification
The Fitbit Charge 5 has a serial on the back of the tracker. The Fitbit app also lists it in the device settings.
Charging
Charge it with the cable that came with it, lining up the contacts. Wipe both with a dry cloth. A full charge lasts several days.
Sensors
The tracker measures heart rate, skin temperature and activity. Wear it snugly, a finger's width above the wrist bone, for good readings.
Battery and care
The Charge 5 lasts several days on a charge. Clean the back with a damp cloth and let it dry. If the screen does not wake, press the side button or restart the tracker.
Syncing
The tracker syncs with the Fitbit app by Bluetooth. If it does not sync, keep the app open, turn Bluetooth off and on and restart the tracker.

Where these figures were read. device101.fitbit.com/guides/morgan-101.html (Fitbit's own Charge 5 101 guide; discontinued from Google Store, superseded by Charge 6) (tracker, built-in GPS, ECG, EDA; no mic/speaker)

Manufacturer support for this product line. Google Fitbit Help — Fitbit help. Official Fitbit setup, charging, sensor, notification and sync guidance.

Also read for this model. Android Authority — Fitbit Charge 5 review; Trusted Reviews — Fitbit Charge 5 review.

Exact questions

Questions that only have an answer for the Fitbit Charge 5

My Fitbit Charge 5 screen is hard to wake or control.+

The Charge 5 is touch-and-tap only with no physical button, so it can feel unresponsive if your fingers are wet or the screen is dirty, or if the raise-to-wake sensitivity is low. Clean and dry the screen, adjust screen-wake settings in the app, and use a firm double-tap. The Charge 6 added back a physical side button partly to address this. Wet or gloved use is the common cause of poor touch response, not a fault.