How to watch the match on your phone without draining the battery

How much capacity do you actually need?

Before you spend anything, work out which of these three you are. Most people buy one size too big for the way they actually watch, and then leave it at home because it is heavy.

• One match, at home. Nothing at all. A modern phone does ninety minutes of video on a full charge without drama — the settings further down are enough on their own, and they cost nothing.
• One match, out, on mobile data. A slim 10,000 mAh bank covers it comfortably, usually twice over, and it is small enough that you will actually carry it. The magnetic one is the right shape here, because it stays attached to the phone you are holding up.
• A full day, or a group of you. 20,000 mAh. A tournament Saturday, a group-stage double-header or a long drive is where capacity stops being a number on a box — and it is the one that ends up charging everyone else’s phone too, which is its own kind of popular.

Where the charge actually goes

Three things drain a phone during a live stream, and they are wildly unequal. Knowing which is which is what makes the next section worth two minutes of your time.

• The screen, by a distance. On almost every phone the display is the largest single consumer, and brightness is close to linear — the same match at half brightness costs meaningfully less than at full. Nothing else on this list is as cheap to fix.
• The cellular radio, when the signal is weak. A phone in a poor 4G or 5G area spends power shouting. Full-strength Wi-Fi is far cheaper than a one-bar mobile connection, and the gap widens the worse the signal gets — a stadium concourse being the classic example.
• Heat, indirectly. A hot phone protects itself by slowing down and dimming the screen, and it charges more slowly while hot. Heat does not only cost you charge; it costs you the picture you were trying to keep.
• Everything else, less than you think. Background apps and notifications are real, but over ninety minutes they are a rounding error next to the three above. Fix those and you have done most of the work.

Nine settings, two minutes, before kick-off

None of this costs anything, and together it is worth more than any single item in the list above. Do it before kick-off rather than during — changing stream quality mid-match usually costs you the restart, and you will miss the goal you were trying to save battery for.

1. Turn auto-brightness off and set the slider by hand, around half. Auto-brightness drives the screen to maximum the moment you step outside or a bright replay fills the frame — exactly when you are least likely to notice.
2. Get on Wi-Fi if there is any at all. Weak cellular is the most expensive way there is to stream.
3. Drop the stream quality from 1080p to 720p in the app’s own settings. At arm’s length on a phone-sized screen the difference is small, and it saves mobile data as well as charge.
4. Switch on Low Power Mode or Battery Saver. It trims background work and, on many phones, lowers the display refresh rate — which video does not need and will not miss.
5. Turn off background app refresh for everything that is not the match.
6. Turn off the always-on display. It is running the screen while the phone lies face down on the table between halves.
7. Use one app. A live stream plus a scores app plus a group chat is three things decoding and refreshing at once, and the stream is the one that suffers.
8. Take the phone out of a thick case, and off any wireless charger. Both trap heat, and heat is what dims the screen.
9. Plug in before you start rather than at twenty per cent. A phone charges fastest while it is still cool and still has charge in it.

Heat is the part nobody warns you about

Every phone has a thermal limit, and video decoding plus a bright screen plus a charging cable plus direct sun will find it. What you see is not a warning message — it is the screen quietly dimming, the frame rate dropping, and in the worst case the video app closing itself. It looks exactly like a bad stream, and it is a hot phone.

• Out of direct sun. A phone in a car mount on a sunny day is sitting in an oven, and no setting compensates for that.
• Off the wireless charger for long sessions. Wireless charging makes more heat than a cable and delivers less of the power to the battery. It is the right answer for convenience and the wrong one for a full match.
• Out of the thick case while charging. A rugged case is insulation. It is doing its job, and its job is not helping here.

Charging while you watch, done properly

Watching plugged in is not cheating, it is the answer — but only when the parts match. A 20,000 mAh bank fed through a tired cable can still lose ground against a bright screen on 5G, and then you have carried a brick around for nothing.

• Capacity is not speed. mAh is how much, watts is how fast. You want both — a bank that can genuinely deliver 20W or more to the phone while it plays, not one that stores a lot of charge slowly.
• The cable is part of the circuit. A charge-only or worn-out cable caps the wattage no matter how good the bank and the phone are. It is the cheapest part and the most common bottleneck.
• Six feet, not three. Cable length decides where you are allowed to sit. For watching rather than charging overnight, it is the cheapest comfort upgrade on this page.
• Top the bank up the night before. A power bank that has been in a drawer since the last tournament is not full, and it will not tell you so until the second half.

Common questions