The EVE MB31 is a very popular cell, also among battery manufacturers. The cell has a capacity of 314Ah, and its predecessors and alternatives are also typically around 300Ah.
This means that you are often locked into a battery size of around 300Ah, even though in many cases a smaller capacity would be sufficient.

A voltage of 48V is very popular for solar battery storage, and 72V is common for smaller electric motorcycles. However, to get the most out of the QS180 motor, we need to go up to 96V.

Bonnen Batteries produces 96V battery systems based on these cells, which makes them a strong candidate for winch applications.

Recently, Bonnen has also introduced a new 96V 10kWh high-power battery, which is significantly smaller and lighter than the traditional 30kWh (314Ah) version. Despite its compact size, it is capable of delivering up to 300A for 2 minutes (3C), which is sufficient to power a tandem hang glider even under worst-case conditions.
This new battery significantly lowers the entry barrier for DIY winches, as the battery cost is a major part of the total budget.

However, the larger 30kWh battery is still highly relevant for clubs or operations that require higher total energy capacity and longer operating time between charges.

Our sister club in Denmark has already tested the 30kWh battery for a full season without any issues. However, they have gained some experience that is worth considering when purchasing a new one. The battery often comes with a CAN-controlled charger, and it is important to pay attention to the default charging current. Building electrical installations are typically strained by a charging current of 16A over many hours.

A full charge cycle for a 96V 314Ah battery (≈30kWh) takes about 9 hours at 16A (230V), and about 15 hours at 10A.
In practice, you rarely fully discharge such a large battery, so charging time will usually be significantly shorter.

To reduce strain on the electrical installation, a charging current of around 8A is recommended.

Read more about Bonnen Batteries here:
https://www.bonnenbatteries.com/da/the-rise-of-electric-paragliding-winches-powering-flight-with-lithium-batteries/