The First Charge: SANDRA Battery Habits That Last

By GETAUVE Editorial Team · Published October 26, 2026

The First Charge: SANDRA Battery Habits That Last

You charged it to full, then read the manual. Half of that order was wrong.

The first charge sets the pattern for everything after it. Here's the two-hour window, what to do before it, and the habit that keeps a dual-motor cell healthy.

The Short Answer

Read the controls before the first charge, not after. Then charge to full in one sitting, about two hours, and keep the device on a hard surface with air around it. Run the first session at a low level for ten minutes, on one zone only. From there, charge weekly before the device drops below half, and don't leave it plugged in for days.

What the First Charge Actually Does

Say it's 9 p.m. and you've just opened the box. A new lithium-ion cell arrives partly charged, usually somewhere in the middle. The first full charge doesn't "activate" it in any meaningful sense. That's a habit inherited from older battery chemistry.

What it does is establish a baseline: how long a full charge takes, what the indicator does at the end, and roughly how much runtime you get. Those are the facts you'll compare against in six months.

So the first charge is less about the cell and more about you. It's a calibration, and it's worth doing deliberately rather than overnight while you sleep.

The Two-Hour Window

SANDRA takes about two hours to charge from empty, and that number assumes a charger that can supply the rated current.

A laptop port may be slower. A wall adapter rated below the device's draw will be slower still. Neither is a defect, and both are worth knowing before you conclude the battery is bad.

The first time you charge it, two hours is roughly one film, which is a better anchor than a timer. Start it with the film, stop it when the credits roll.

Put it on a hard surface with air around it. The shell is sealed, and a sealed shell holds warmth. Charging it inside a closed drawer or under a pillow runs warmer than charging it on a dresser.

The indicator is the thing to watch, not the clock. When it says full, unplug it. Leaving it connected for another six hours doesn't add capacity, and it does keep the cell at a high state of charge for longer than necessary.

Why the First Session Should Be Short

Ten minutes, one zone, low level. That's the recommendation for the first session, and it's about information rather than caution.

A dual-zone device with 12 levels has a lot of range, and the first session is where you find out how the range feels. Ten minutes is long enough to learn the scale and short enough that you don't spend the whole time adjusting.

One zone keeps the variables down. If something feels wrong, you know which motor it was.

A short first session also shows how much charge ten minutes costs, which makes the weekly math concrete. On SANDRA, ten minutes is roughly a ninth of the 90-minute runtime, so a session is cheap and a week of sessions is manageable.

Write the number down if you're the type. It's the baseline everything else gets compared to.

Building a Charge Cue

The habit that lasts isn't discipline. It's a cue attached to something you already do.

Pick a weekly action: laundry, taking out the trash, coffee on a Sunday. Put the device on the charger when you start that action, and take it off when you finish.

This works because the cue is external. You're not remembering to charge. You're remembering to do the thing you always do, and the charger is part of it.

Keep the cable in the same place. A cable that lives in a drawer and comes out once a week is a cable that gets lost, and a lost cable is the most common reason a device sits unused.

Under 45 dB and 7 inches long, SANDRA is small enough to charge on a nightstand without being conspicuous. That's an advantage for the habit, even if it's not a spec anyone lists.

The First Month Check

Before bed on the last day of the month, do three checks. Each takes under a minute.

• Runtime: does a full charge still cover roughly 90 minutes at a mid level?
• Charge time: does it still fill in about two hours?
• Shell: does the body sit flat, and does the joint feel the same as it did?

If runtime has dropped by a third in a month, something is wrong beyond normal aging. The usual suspects are charging in a hot place, charging in a closed drawer, or leaving it plugged in continuously.

If the charge time has shortened instead, that's the same capacity problem from the other direction. A cell that fills in an hour has less to fill.

IPX7 means you can rinse the body, but keep the port dry. A wet port is a charging hazard, and it's the one maintenance mistake that turns a working device into a dead one.

When the Routine Doesn't Fit

Skip this routine if you use the device twice a month. A weekly charge is unnecessary, and the honest advice is to charge the day before you plan to use it. If you're buying for someone who won't track anything, a bigger battery serves them better than a stricter habit. And if the device lives in a travel bag, storage at half a charge matters more than any weekly schedule, because a cell held at full for months ages faster than one held in the middle.

Sources

• Consumer Product Safety Commission — guidance on lithium-ion battery charging and disposal.
• National Fire Protection Association — general information on battery charging hazards.
• International Electrotechnical Commission — IPX7 ingress protection definitions.

This is general education about battery care, not medical advice. A swollen battery should be retired and recycled, never charged again.