I have been using Energizer Lithium batteries and had a bad experience on Sat night. I went through 2 new sets. Each set got very hot, very quickly and caused my flash not to recharge. There were times I was having to wait 5 mins or so before taking my next photo. I was told today that Lithiums have been known to overheat and possibly even blow in the flashes. Is this true? Which batteries would you recommend for this flash to ensure faster recharge time? Thanks!