The battery or batteries in this environment it needs to be able to withstand the high temperatures and high vibrations of the underground environment. Downhole high temperature environment will be (>100C).
The battery needs to be a non-rechargeable lithium battery. Lithium-ion batteries are commonly used in downhole drilling equipment because of their high energy density, long cycle life, and low self-discharge rate.
These batteries can operate over a wide temperature range and have high power output and fast charging capabilities. Lithium-ion batteries are also lightweight and small in size, making them suitable for use in cramped and harsh environments.