The dry cell ⒈: listed common battery again, the need to point out the common dry cell alkaline batteries quality is better, but even so, These batteries are not suitable for high-current discharge, friends must know used a digital camera, four AA batteries into the shoot not a few on the OVER, its Real battery is not used up, high-current discharge put bad, slightly better point the flashlight with alkaline battery market is getting smaller and smaller ⒉ Ni-MH (Nickel-cadmium) batteries: rechargeable, civilian models, dry battery specifications have also various other models, in short, you need to understand There are two things, first of all, as long as it is a nickel-metal hydride (Ni-Cd) batteries, a single voltage is 1.2V (nominal) and red foot actually had to be a little higher that 1.5 also can be, a plurality of batteries of the battery pack is a multiple of the voltage. For example see 12V nickel metal hydride (Ni-Cd) battery that is 10 battery Out of the heap; Secondly, the nickel-metal hydride (Ni-Cd) battery memory effect, directly discard the substances contained in the environmental pollution is very powerful, self- discharge strict Weight, general Month 20-30%, and 20% of the super famous, but the price is also very expensive, not cost-effective because of these reasons are gradually being eliminated