FAQs

• Do I need a special charger?

No need! There is a USB-C port right on the SZEMPTY battery. We provide a 4 in 1 USB-C cable so you can charge 4 batteries at once.

• How long do they take to charge?

Charging time is surprisingly fast, but will depend on the USB power you are using. Typically the battery fill time is roughly as follows:

AA:2-3H ；AAA:1-2H；D:4-6H；C:2-3H; 9V: 1-2H; CR123A:1.5-2H

• What kind of charger should I use?

Each SZEMPTY battery charges at 0.5A. If you are using our 4:1 cable to charge 4 batteries at once, the USB power supply should be rated for 2A output to optimize charging time (the power supply itself will be labeled).

Most newer smartphone and tablet power supplies support 2A charging, but some older power supplies or computer USB ports may only support 1A or 0.5A output. SZEMPTY batteries can still be charged with lower output power supplies, but it will take longer.

• How many times can they be recharged?

Thanks to the advanced Lithium Ion technology, your batteries will last over 1200 charges.

• Can I use my SZEMPTY batteries while recharging them?

For safety reasons, SZEMPTY batteries do not support charging while in use. We cannot predict all usage situations and the problems that may arise during those usage situations, and therefore we cannot ensure the safety or reliability of our products while charging while in use.

• How do I know when they are charged?

Except for 9V batteries, other models are green light blinking while charging and green light always on when full.

9V battery： red light in charging, green light when full.

• Why do batteries get hot when charging?

Batteries heat up during the charging process due to the conversion of electrical energy into heat through internal reactions. Factors such as internal impedance, charging rate, and battery type (especially lithium-ion batteries) can all contribute to heat generation.SZEMPTY batteries can reach a maximum temperature of 65°C at the positive electrode during charging because of the fast charging rate. Please do not touch the positive terminal of the battery during charging to avoid burns.

• How does the capacity compare to typical alkaline batteries?

This is a technically complex issue to answer comprehensively, but let’s look at it through the lens of power output. For any application where power matters (such as a headlamp where brightness matters or a remote control toy where power/speed matters), lithium ion chemistry is superior.

Our AA batteries are available in three capacities: 3400mWh, 3000mWh, and 2600mWh. If you look at the capacity of the batteries, 3000mWh is roughly the same as a normal dry cell battery.

• How long will Paleblue batteries last?

When measuring useful capability, we can look at the time for the battery performance to degrade to half of its starting power. The discharge time to get down to 50% of starting power is about the same for SZEMPTY and Alkalines. So, in this respect, we are competitive with what you expect from Alkalines.

• Can I bring these on an airplane?

You should have no problem putting it in your carry-on luggage. Because all our batteries have less than 20Wh. But we can't speak for every airline's policy, so please check.

• Can I use SZEMPTY batteries to charge my other devices, such as my phone?

Sorry,you can not. The TYPEC port on SZEMPTY batteries is for charging the batteries on

• If the batteries are punctured, is there a risk of explosion?

The batteries are tested (and have passed) IEC62133-2:2017 This is the international safety standard for all lithium batteries. It includes very extensive safety testing, a crush test and flame test. SZEMPTY batteries are designed to pass all these tests safely with the external metal casing, which is stronger than many typical Lithium battery designs. No Lithium battery should ever be punctured with a metal object, such as a nail, this is the same for a mobile phone battery or power bank, or even a Tesla EV.

• Can I use your 9V in my smoke or carbon monoxide detector?

Most smoke detector and carbon dioxide detector manufacturers recommend against using rechargeable or rechargeable lithium batteries in their products. Be sure to carefully review your smoke detector and carbon monoxide detector instruction manual and the manufacturer's recommendations before selecting the correct battery. If in doubt, do not use rechargeable or rechargeable lithium batteries in your detector.

• Will SZEMPTY batteries work in my device?

In general the SZEMPTY USB lithium rechargeable battery is compatible with most devices on the market. Be sure to check owners manual for your device to see if it recommends using lithium batteries.

• Do I need to recharge the battery if it's fully charged and not in use for a while?

It is advisable to recharge the battery every 6 months if it has been fully charged and remains unused for an extended period. This helps maintain its health and prevents performance degradation.

• Lithium batteries should not be used in high-current devices such as flash units. If used, the batteries may overheat, the outer skin may peel off, and the batteries will not function properly.
• When the battery is connected to a charging cable, ensure the positive and negative terminals do not touch, whether charging has started or not.
• It is recommended to use the charging cable that came with the device and connect it to a 2A output Power Supply Unit (PSU) for optimal charging.
• Insert the batteries into the device in the correct orientation as indicated. Do not reverse the orientation.
• Do not mix different brands or types of batteries in the same device.
• Do not mix charged and uncharged batteries in the same device.
• Do not use the battery while it is charging.
• Fully charge the batteries before use, as they are shipped at only 30% charge for safety.
• Do not leave batteries unattended while charging. Do not charge them under your pillow, on your bed, or on any flammable surface.
• Do not touch the positive terminal of the battery during charging to avoid burns. The positive terminal can reach up to 65°C due to the fast charging speed of lithium batteries.
• Store batteries at room temperature in a cool, dry place, away from anything flammable. Do not place batteries in direct sunlight or hot vehicles.
• For batteries stored or unused for a long period, it is recommended to charge them every 6 months.
• Keep batteries away from fire and water. Do not expose them to water, fire, or temperatures above 45°C (113°F).
• Do not damage, open, puncture, or disassemble the battery casing.
• Keep batteries out of reach of children and pets.
• Do not short-circuit the battery by connecting a wire or metal object directly to the positive/negative terminals.
• Do not place batteries in a microwave, oven, induction stove, or hob.
• Do not keep batteries in a pocket, purse, or any container with metal objects to avoid short-circuiting or incineration.
• The battery assembly contains safety and protection circuits that should not be altered. If these circuits are damaged or removed, the battery may overheat or catch fire.
• If the battery emits a strange smell, gets hot, changes color or shape, or appears abnormal, stop using it immediately and contact SZEMPTY for support.
• If the battery leaks, avoid contact with eyes. In case of contact, rinse immediately with water and seek medical attention.
• Do not use the battery if the outer wrapper is damaged. Do not disassemble it.
• If the battery light flashes too quickly, replace the charging cable or charger. If it continues to flash quickly, do not use it and contact SZEMPTY for support.
• Follow local regulations for recycling electronic devices and batteries.
• By following these guidelines, you ensure safe and optimal use of your SZEMPTY USB rechargeable batteries.