There are 2 different batteries -
The first is the standard, a LiPo 55 mHA rechargeable battery, that is charged within 30 minutes, and it lasts for +4 hours of spin. This battery is used for all the LIMBO models, except for LIMBO WR.
In LIMBO WR, we used a much more powerful battery, that can last to +40 hours of spin. We wanted to fit it in the same casing, so we couldn't make it rechargeable, hence it is disposable.
The WR kit comes with 4 of these disposable batteries, and the standard mechanism, so it can be used in both ways.