The Galaxy A35 has a 5,000 mAh battery that should last well over a day, so owners who now charge it three times a day are describing a fault rather than a limit. The threads on Samsung's forums tie it to One UI 8.5: some owners charge to 80, 90 or 95 percent three times a day, and a thread on A35 drain and heating runs to many pages. The explanation that fits is the one Samsung's moderators give for the whole Galaxy line, a settling update and a background app, plus two A35 factors.
The Exynos 1380 with 5G draws heavily in a poor-signal area, and a phone near full storage works harder. Check storage, check 5G, then check which app is using the most. The Samsung Members battery test says whether the cell has worn.
Differential
Likely causes of “Samsung Galaxy A35 5G battery drains too quickly”, and how to tell them apart
- 1
One UI 8.5 settling
What separates it Drain began after the update
How to confirm Install the newest patch and allow up to two weeks
- 2
5G in a weak-signal area
What separates it Drain is worst away from Wi-Fi
How to confirm Set Mobile networks to LTE and compare
- 3
A nearly full phone
What separates it Storage above about 80 percent
How to confirm Free space, or move media to the microSD card
- 4
One heavy app
What separates it One entry dominates Battery usage
How to confirm Put it to sleep under Background usage limits
- 5
A worn cell
What separates it The battery falls in steps
How to confirm Samsung Members, Phone diagnostics, Battery status
Before you touch a setting
Record this first — changing settings destroys the evidence
- How many times a day you charge and to what percentage
- The top apps in Battery usage
- Free storage
- The One UI version and patch date
Try in this order
0 of 6 completedInstall the newest patch and restart
ReversibleOpen Settings, Software update and install anything waiting, then restart; owners who tie the drain to One UI 8.5 are waiting on patches, and a restart ends a background job left hanging.
Try LTE for a day in a weak-signal area
ReversibleSettings, Connections, Mobile networks, Network mode: choose LTE and compare the day's drain, because the Exynos 1380 working on a poor 5G signal is a known power sink on this phone.
Bring storage down to about three-quarters full
ReversibleSettings, Battery and device care, Storage: delete or move media until used space is near 75 percent, which is the level at which one owner found the A35's heat and drain eased.
Put the busiest app to sleep
ReversibleSettings, Battery, Background usage limits: add the app at the top of Battery usage to Sleeping apps, and compare the next day's chart.
Wipe the cache partition after an update
ReversiblePower off, hold volume up and the side key into Recovery and choose Wipe cache partition; your files stay and stale system caches are rebuilt.
Let the phone test its own cell
ReversibleSamsung Members, Get help, Phone diagnostics, Battery status gives a verdict; a poor result on a phone with a 5,000 mAh cell justifies a Samsung battery replacement.
Model-specific
What is true of this model and not of its siblings
- What a normal A35 day looks like
- A 5,000 mAh cell with an efficient mid-range chip should give a full day and part of a second on mixed use, so charging three times a day is about twice the draw it should have.
- Why 5G matters on this phone
- The A35 supports 5G, but in a weak-signal area the radio works hard and the Exynos 1380 adds to the draw; LTE in those places is the saving owners overlook.
Stop boundary
When this stops being a self-service repair
- !If the phone needs charging three times a day after the newest patch and Safe mode, send a Samsung Members error report
- !If diagnostics reports a worn battery, ask Samsung about a replacement
- !A hot or swollen phone is a same-day visit
Evidence ledger
Sources behind this answer
A35 owners reporting fast drain after One UI 8.5.
A35 owners charging three times a day after the update.
A long thread about A35 heat and drain.
Battery, charging, chip, storage and microSD slot of the Galaxy A35 5G.
Exact questions
Common questions
Is it normal to charge an A35 three times a day?+
No. Owners who do so after One UI 8.5 report it on Samsung's forums, and the steps here are the ones they were given.
Does the A35 battery wear quickly?+
Not unusually; a phone under two years old with a poor battery test is worth a Samsung check.