im looking into a battery charger, that will charge two batteries at once now that you saY that what is better NIMH OR NICD? i am just getting started so i want to get the things that will last the longest . wow that 4200 probably will run for a while . my 2000 doesnt last long now . im looking into that inellipeak dual pulse charger which says it will do both . but now i need to know what batteries are better ? NIMH OR NICD