Hi, I work at a primary school and we have purchased 12 of the Uniden uh036sx-4 staff to use. We are using rechargeable batteries to try and reduce our costs, but they are having to be recharged every night. We are using Arlec batteries. If we have to go back to the non-rechargable batteries, we're still going to have to replace them once a week and that will be very expensive. Is it the batteries we are using, that is the problem or is the radio just not able to stay charge for any longer whatever we use.