3ME Technology is an Australian company which has been working on battery systems for the ADF for the past few years.
Recently, they created a new form factor which mimics the size and weight (22 kg) of a 5 gallon Jerry Can, providing 24V 2.4 kWh. This means single person lift.
Weatherproof, they can be used alone or connected in serial (up to 10) for higher power requirements. What’s more, they are hot swappable while in serial.