【USB 9V Lithium battery+Storage box】9V rechargeable battery13500mWh long lasting Li-ion batteries without memory effect, provide steady voltage until the whole cell is depleted. We had upgraded our 9V li-ion batteries batteries, make it reach to 8.9V- 9.1Volt when fully charged. 【USB-C 9 volt batteries Charging Design】1500 Tech, up to 600 times deep charging & discharging cycles (others normal is 400times) , high quality ensured.Convenient to charge anywhere directly with provided USB-C cable, no need extra battery charger. The build-in LED lights allow you to check the charging status. 【Quick charge in 1.5 hours】 Rechargeable 9 Volt Battery Advanced charging technology with DC 5V/1A USB input, the batteries are full charged in 1.5hours, save time and more efficient. 【Widely Application】These 9V Lithium battery and charger pack works with a variety of devices including smoke alarms, digital cameras, game controllers, toys, clocks, professional audio, and medical devices. 【Premium Service】Please check the quantity you purchased before you buy.24 hours reply to email,30 days refund,If you receive defective batteries or quality problem,please let us know and we will solve it as soon as possible. TQTHL 9V Battery for Smoke Detector,USB Rechargeable 9V Lithium Batteries - 13500mWh Long Lasting LI-ion Batteries with USB-C Charging Cable - Quick Charge in 1.5 Hours, (4 Pack)