You might also be interested in these battery pack for christmas jumper.
Ahigh 20000mAh Battery Pack, 5V Power Bank for Heated Vest Jacket Coat Pants and Heating Underwear, Heated Clothing Replacement Battery Pack
Ahigh
£ 34.99
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MKBKLLJY CR2032 Battery Holder 2 X 3V Coin Cell Holder with Wires 14.8cm/5.8inch Bare Wire Ends Slide Button ON/Off Switch Spring Clip Cell Storage Boxe Cover with Black/Transparent (10 Pcs)
MKBKLLJY
£ 9.00
free shipping
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DC 3.7V 900mAh 702050 Rechargeable Lithium Polymer Battery, Suitable for DIY 3.7-5V Electronic Products with Built-in 2-Wire Battery Replacement and LED Lights
RUNCCI-YUN 10PCS CR2032 Battery Holder Plastic 2x3V Button Coin Cell Battery Holder Case Box with Wire Lead ON-OFF Switch, 3v battery holder with switch (Black)
RUNCCI-YUN
£ 6.99
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RUNCCI-YUN 20PCS Button Battery Case, CR2032 Battery Holder with Wire Lead ON-OFF Switch (transparent) + 10 Crocodile Clips
RUNCCI-YUN
£ 5.99
free shipping
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PAIYULE Case Compatible with DeWalt DXAELJ16 1600 Peak Amp Jump Starter Battery Booster, Portable Jumper Storage Holder Pocket for USB Power Station (Box Only) Black
PAIYULE
£ 22.61
free shipping
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Lithium Polymer Batteries, MACHSWON 2pcs 2200mAh Rechargeable Lithium Core Batteries for Heated Gloves Socks Hats, UL FCC Safety Certification
MACHSWON
£ 35.69
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3.7V 2600mAh Rechargeable Lithium-ion Battery with PH2.0 Connector
Hosifiy
£ 9.99
free shipping
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Uxney 3.7V 2600mAh Rechargeable Batteries Lithium ion Battery with XH2.54/2P Connector ,Please check device and connector polarity before purchase