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SWITCH TO RECHARGEABLE: Stop wasting money on standard alkaline 9V batteries! Switch to our rechargeable lithium batteries for the same great performance. Reuse the batteries repeatedly. Be eco-friendlier and more cost-effective Type C USB CHARGING: Directly plug a Type C USB into the input for quick and easy charging. Use the included cable to connect simultaneously connect 2 batteries to any USB power supply. Connect to an AC adapter, power bank or computer, and fully charge in around 1.5 hours. Long lifecycle will allow over a 1200 uses LED INDICATORS: When charging, the red LED will blinks and will then LED remains on once it is fully charged. Conveniently see the charging status of each battery LARGE CAPACITY: 650mAh capacity provides sufficient power for a wide range of products. Perfect for smoke detector/alarms, multimeter alarm systems, digital cameras, calculators, pencil sharpeners, portable radios, guitar pedals/pickups, walkie-talkie, microphones, toy remotes, clocks, flashlights, professional audio devices, medical devices and other high drain electronic devices and so on CETIFIED SAFETY: Compliant with North American safety standards. CE, FCC and RoHs recognized safety for guarantee user and device safety