The Galaxy Note9’s S Pen is Bluetooth compatible and its remote functions are operated via Bluetooth. Because of this the S Pen does need to be charged to keep working.
Samsung say on their website that when the S Pen is fully charged it will last for about 30 minutes, or let you make around 200 clicks.
When the S Pen is fully depleted or discharged, Air command and Writing/Drawing can still be used.
When the S Pen falls below 20% charge capacity you will see a notification on the Note9’s screen. Below is how you can see the exact charge level of the S Pen using Remote settings:
- Open the Air command menu with the S Pen and tap ‘Settings’ in the upper left corner
- Tap ‘S Pen remote’, and the battery will be displayed at the top of the page.
To charge your S Pen simply insert it into its resting position within the body of the Note9, this starts the wireless charging process. The charging process takes 40 seconds.
To power to the S Pen’s Bluetooth module, a supercapacitor or Super Capacitor has been integrated into the S Pen instead of a normal lithium-ion battery. This super capacitor does not hold as much charge as what a lithium-ion battery would do but the charging time is considerably shorter, in fact Samsung say that fully charging takes about 40 seconds.
The S Pen’s super capacitor (which ifixit.com found to be a K8373 Seiko Instruments supercapacitor ) charges wirelessly when it’s inserted into your Note9. It only takes about 40 seconds to fully charge the S Pen.
Image Credit ifixit.com
Due to the fact that the S Pen is inserted and pulled out frequently and is used usually used for a short amount of time when it has been pulled out, this form of charge storage and its quick charging is very appropriate for this application.
The advantages of using a super capacitor over a battery are as follows:
- Because it doesn’t require a chemical reaction to charge or generate electricity, the life cycle of a super capacitor is very much higher than a battery.
- Unlike a battery, a super capacitor can be charged and discharged almost indefinitely. Batteries have a defined cycle life but, there is very minimal wear by cycling a super capacitor. A super capacitor’s service life, or load life, can reach 10 to 15 years or more (see this resource for more information).
- Super capacitors of this size charge in seconds
- Super capacitors are environmentally friendly.
The wireless charging process for the S Pen works by creating a magnetic field between the coil inside the Note9 and a coil inside your S Pen. The S Pen must be inserted completely into the device for the charging process to commence.
Image Credit Samsung
Charging the S Pen will do little to drain your Note9’s battery even when our S Pen is fully discharged as it only takes about 0.5 mAh to fully charge the S Pen. Considering the battery capacity of your Note9 this is very insignificant and will not have any major impact on the Note9’s battery life.
What Is A Capacitor?
Without going to heavily into the physics behind how they work, a capacitor is a device that stores energy via a static charge. The main difference between a battery and a capacitor is that a battery generated electrical current by a chemical reaction whereas a capacitor, has two metal plates, a positive metal plate and a negative plate. The voltage differential between the plates provides an electrical current. Below is a simplified diagram of a capacitor’s plates.
A super capacitor is a high-capacity capacitor with a capacitance value much higher than other capacitors. A super capacitor typically stores 10 to 100 times more energy than an normal electrolytic capacitor and can accept and deliver charge much faster than batteries.
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