Batteries

Lithium

Battery sizes of cylindrical lithium-ion rechargeable battery

Chemistries

• LTO 

Manufacturers

• Jetspower

• Yinlong - LTO types - Now known as Gree

• DIY Solar forum list of LiFePO4 manufaturers. One of the posts link to EVE. Study the rest of the posts.

Local Resellers

• https://www.robotics.org.za/INR18650-35E

• Takealot

• BatteryExperts (Cylindrical)

• https://lithium-cells.co.za/

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International Resellers

• Small den are scammers

• https://www.18650batterystore.com/products/samsung-35e

• https://eu.nkon.nl/

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FORUMS

• DIY solar power forum Ask them about source for best cylindrical cells.

• Power Forum ZA

Mechanical

• Battery Spacer

CHECK OUT ANSWER https://diysolarforum.com/threads/what-battery-terminals-is-this-and-why.61950/