The SprkCharger Slim stainless-steel case may get warm to the touch during charging and discharging. This an intentional design feature to manage the device heat. Discharging the Slim converts the chemical energy in your power bank to electricity. Charging the Slim converts electricity into storage energy in the Lithium-Ion battery cell. Waste heat is created in the cell and charge electronics for each step. The SprkCharger Slim has been engineered to intentionally conduct this heat out to the stainless-steel case which acts as a heatsink to increase the life of the cell and the electronics. The design has been Safety...

The magnets used in the SprkCharger products are N52 Neodymium rare earth magnets. N52 grade are considered the strongest and most expensive magnets commercially available. They were chosen to ensure strong high quality electrical and mechanical connections on the products. The connector to cable connection provides a strong connection while allowing more than 180 degree rotation. The connection is strong enough to carefully lift the weight of a phone yet will break away if the cord is unintentionally pulled preventing damage to the phone. A high-quality gold spring connector completes the circuit in the center of the connectors. MAGNET SAFETY...

With an “average” cell phone size of ~3700 mAh a full Slim charge will support roughly 45% increased use time. If YOUR typical phone discharge is 9 hours of use the Slim will provide (.45 x 9)  4 Hrs. of your additional full function with calls, streaming, email etc. If a full charge lasts you 12 Hrs. based on your use patterns Slim will provide 5.4 Hrs. of additional use. (See reference table for range of phone cell sizes and use rates) Extended Full Use Hrs based on Your typical use profile Phone % Charge Typical hrs to discharge to...

#1 Samsung Galaxy S20 Ultra – Customer - Rich H Rich used his S20 phone as a cellular hot spot for his computer Wi-Fi access from his cabin in northern Minnesota. He attached his Slim to the S20 charged at 29% and used the S20 as a cellular Wi-Fi hot spot for 2.5 hrs. At the end of the use his S20 had a battery charge of 37%. The Slim provided the full power for the access point use and also increased the S20 battery charge 8% from the 29% starting point.   #2 iPhone 12 Pro Max - Customer...