You're replacing 3.2V LiFePO4 18500 Lithium Batteries, not 18500 3.7v Li-ion Batteries! 18500 3.2V Batteries. 18500 3.2V Batteries for Garden Solar Lighting: Roma, George, Solar LED Garden Light, Lights with or without sensor.
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4pcs Lithium Iron phosphate battery lpega Cylindrical 3.2V 15Ah Lifepo4 Cell for RV Electric Car Energy Storage Battery
Aliexpress UK
Applicable batteries: lithium iron phosphate, lithium manganate, lithium cobalt oxide, ternary. Quantity: for 2 set(6pcs). Only a shell, there is no battery cell. Note: The real color of the item may be slightly different from the pictures shown on website caused by many factors such as brightness of your monitor and light brightness.
eBay
LiFePO4 3.2V 200AH lithium iron phosphate battery, automotive energy storage battery, rechargeable battery DIY12V solar energy
Aliexpress UK
Applicable batteries: lithium iron phosphate, lithium manganate, lithium cobalt oxide, ternary. Only a shell, there is no battery cell. Color: Black. Quantity: for 2 set(6pcs). for 2 x Top Shells.
eBay
EU Stock Grade A 3.2V 314Ah Lifepo4 Rechargeable Battery Lithium Phosphate Travel Solar Campers Cell 12v 24v batteries Tax Free
Aliexpress UK
Applicable batteries: lithium iron phosphate, lithium manganate, lithium cobalt oxide, ternary. Only a shell, there is no battery cell. Quantity: for 2 set(6pcs). for 2 x Top Shells. Note: The real color of the item may be slightly different from the pictures shown on website caused by many factors such as brightness of your monitor and light brightness.
eBay
LiFePO4 Battery 24V 100Ah 12V 300Ah Iron Phosphate Lithium Battery Pack Grade A 8000+ Cycles Home Cart Golf RV Boat Batteries
Aliexpress UK
Applicable batteries: lithium iron phosphate, lithium manganate, lithium cobalt oxide, ternary. Only a shell, there is no battery cell. Quantity: for 2 set(6pcs). for 2 x Top Shells. Note: The real color of the item may be slightly different from the pictures shown on website caused by many factors such as brightness of your monitor and light brightness.
eBay
MT20DL Battery Adapter Converter for Makita 18V Li-ion Battery to for DeWalt 18V/20V Lithium-Ion Battery Tool Drill
Aliexpress UK
Applicable batteries: lithium iron phosphate, lithium manganate, lithium cobalt oxide, ternary. Quantity: for 2 set(6pcs). Only a shell, there is no battery cell. Note: The real color of the item may be slightly different from the pictures shown on website caused by many factors such as brightness of your monitor and light brightness.
eBay
3S1P 12.6V 2500mAh 18650 Lithium-ion Battery Pack 11 1v li ion battery 18650 for Backup Power Ups CCTV Camerar 12v battery packs
Aliexpress UK
Applicable batteries: lithium iron phosphate, lithium manganate, lithium cobalt oxide, ternary. Quantity: for 2 set(6pcs). Only a shell, there is no battery cell. Note: The real color of the item may be slightly different from the pictures shown on website caused by many factors such as brightness of your monitor and light brightness.
eBay
AA Battery 1.5V Li-ion AA Rechargeable Battery 9800mWh AA Lithium-ion Battery for remote control mouse small fan Electric toy
Aliexpress UK
Applicable batteries: lithium iron phosphate, lithium manganate, lithium cobalt oxide, ternary. Only a shell, there is no battery cell. Quantity: for 2 set(6pcs). for 2 x Top Shells. Note: The real color of the item may be slightly different from the pictures shown on website caused by many factors such as brightness of your monitor and light brightness.
eBay
MATOV Li-ion AAA and AA Rechargeable Batteries USB Lithium-ion 3400mWh 1.5V AA Rechargeable Batteries+1100mWh 1.5V AAA Battery
Aliexpress UK