Built in USB Type-C Port for charging. 1x USB-C to USB-A Charging Lead.
eBay
3*4400mAh USB 5V 9V 12V 19V Uninterruptible Power Supply UPS Battery Backup Unit With 5.5x2.5mm
Aliexpress UK
Battery capacity. Advanced Li-Ion technology & High capacity Working temperatures.
eBay
USB 5V 9V 12V Output 6x 18650 DC UPS DIY Power Box for Router Cellphone Tablet Modem Uninterrupted
Aliexpress UK
Specifications: Input： Micro USB 5V/2A Output: 8.4V--260mA. 9V--80mA Fit for: 9V Ni-MH/Ni-Cd/Li-ion Battery use only Product Size: 8.8cm*4cm*1.5cm Package Contents： 1x 4 Slot 9V Smart Charger 1x Micro USB Cable.
eBay
Outdoor Portable Solar Panel 5V 9V 12V Foldable Solar Cell Phone Charger PD+USB For Camping Hiking
Aliexpress UK
Super Long lasting: HiQuick 9 volt li-ion batteries adopt advanced energy gathering ringwith high capacity of 600mAh, which keep longer lasting for smoke alarm detector. Capacity: 600mAh. Battery Cell Composition: Lithium Ion.
eBay
DIY 3x 18650 Battery 5V USB + 3.5X1.35mm 9V + 12V 5.5x2.1mm UPS Power Supply Box for WiFi Router
Aliexpress UK
eBay
Durable Dual USB Output DIY 7x18650 Battery for Case for DC Output 9V/12V Plastic Charging Box
Aliexpress UK
Super Long lasting: HiQuick 9 volt li-ion batteries adopt advanced energy gathering ringwith high capacity of 600mAh, which keep longer lasting for smoke alarm detector. Capacity: 600mAh. By reusing batteries, you are reducing your carbon footprint and the waste caused by disposable one.
eBay
USB+PD solar power bank 5v/9v/12v Photovoltaic panel outdoor camping Portable cell phone charge
Aliexpress UK
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. Long lifecycle will allow over a 1200 uses.
eBay
PUJIMAX 2 Slots Smart Fast Battery Charger With LED Indicators USB Cable For 9V Ni-MH/Ni-Cd/Li-ion
Aliexpress UK
For 9V Block Battery: Battery Size: PP3, HR22, 6F22, 9VOLT Battery Chemistry: Li-ion Voltage: 9V Battery Capacity: 800mAh Brand: SHENTEC Operating Temperature Range: -4°F to 140°F (-20°C to 60°C) Packaging: 4 units Weight: 112g 100% Brand New with Good Quality Also Known As: PP3, HR22, MN1604, BLOC, 6LR61, 1604AU, X22, 1604, 1604A, 1604AC, 4022, 522, 6AM6, 6F22, 9VOLT, A1604, CLR6, K9V, KA9, ND65V, R22, RB100890 etc. For Battery Charger: Input: Micro USB 5V/2A Output: 8.4V═260mA 9V═80mA Charger Type: USB Cable(included) Weight: 40g Charging Indicator: LCD light shows the charging status Compatible Battery: 9V Ni-MH Ni-CD & Li-ion rechargeable battery（1-4 pcs batteries） Certification: CE, RoHs Red Light: Charging Green Light: Fully charged.
eBay
USB 5V for DC 9V 12V Output 6x 18650 UPS DIY Power Box for Router Cellphone Tablet Modem CCTV Camera
Aliexpress UK