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Superior craftsmanship is evidenced by springs made of piano wire; steel cathode with low resistance and hard chromium plating to achieve a more precise charging voltage; and 15,000+ spring testing for quality assurance. Six protection levels : 1. Short Circuit protection 2. Automatic over-charging 3. Automatic over-discharging 4. Reverse polarity 5. OV activation recovery function 6.  Hardware and software double protection Features: 1. Fast charging mode: 1.0A (4.2V 2pcs x 1.0A) 2. Install a 3.6V or 3.7V lithium battery in another size 3. Reverse polarity protection 4. Activation function 5. Automatic detection function charging 6. Overcharge protection 7. Short circuit protection  

The Efest Lush Q4 Charger is a smart 4 slot battery charger from the LED. It also includes the following safety features–over-discharge, over-voltage, short circuit and reverse polarity protection–with independent battery slot monitors and three charging modes: 2.0A, 1.0A, 0.5A. Compatible with any lithium 3.6V/3.7V battery. Batteries can be easily inserted and removed. Q4 chargers also feature auto-stop feature once batteries are fully charged.

• Three charging modes: 2.0A 1.0A 0.5A
• Auto-stop when fully charged & auto-recharge when voltage lower then 4.05V
• 4 kinds of protection like over-discharging, over-voltage, short-circuit and reverse polarity protection
• The batteries at over 0.6V can be activated by Q4 charger
• Battery slot monitors independently
• Compatible with 3.6V/3.7V LiMn/Li-ion batteries (10440,14430,14500,14650,16340,16500,17335,17650,17670,18500,18650,20700,22650,26500,26650)