Check out www.rcbatteryclinic.com for good reliable info on all types of batteries. I assume you are talking about NiCad batteries above. If so, try the suggestion in the site mentioned above, get an appliance timer and, plug your charger and batteries into that. Set it up to put a 1 hour charge each 24 hours using the slow charger that came with your system. This will keep the unit ready to go at any time. Of course this is assuming you have them fully charged when you start this procedure. To do that, just put them on the same charger for 10 hours first then switch to the timer routine. While fast charging works if you are diligent, it is also an easy way to turn your batteries into toast if you forget to watch them and accidently let them get overcharged or over heated.