It might be difficult keeping moisture out of the unit, as already seems to be the case, if he tries to make the batteries removable for recharging. It's a good solution, one I implemented with the Sonicare tooth brush, but it could be troublesome with the waterpix.
I see the MiMH batteries are only 1300mAH. You will be able to more than double that with new ones these days. ...as much as 2900mAH.
I see the MiMH batteries are only 1300mAH. You will be able to more than double that with new ones these days. ...as much as 2900mAH.