Custom a waterproof battery will need to provide the following requirements details:

1.Battery voltage (V)

2.Battery  capacity(Ah)

3.Battery charge and discharge current.(A)

4.Battery usage:

5.Battery connector:

6.Battery size:

7.Battery waterproof level: (IP65 ,IP67,IP68)

8.Battery working environment.

Then PLMEN will design a suitable battery for your project.