Alkaline are the most common used batteries in households. The number one reason for this is because of the cheaper price that alkaline batteries have over their competition. Consumers seem to buy the alkaline batteries thinking they are saving money at time of purchase, when they are really spending more money over time. Alkaline batteries are not designed to be recharged, and are generally discarded once the the battery is exhausted of its stored power. The only advantage that alkaline batteries have over NIMH batteries is cost and discharge rate. The NIMH batteries cost 2 1/2 times more than alkaline batteries, and have a high discharge rate as compared to the alkaline battery. People who keep equipment stored for emergency purposes, such as flashlights when the power goes out. NIMH batteries do not store well over long periods because of their high discharge rate. When the flashlight would need to be used, you could possibly only have 65 to 70% of stored power depending of course on length of time stored. Alkaline batteries have a very slow discharge rate, and are a excellent choice for these applications. Now with that being said its time to take a look at what NIMH batteries have to offer over alkaline batteries. NIMH batteries have a much higher capacity than alkaline. Bottom line, NIMH batteries have a lot more power to offer for high drain devices such has digital cameras. NIMH batteries are rechargeable batteries, and consumers can expect to get 750 to 1000 or more charge discharge cycles out of them. That’s a huge advantage over alkaline batteries for applications such as remote controls, wireless controllers, and kids toys. NIMH batteries can also be recharged to full capacity in less than a hour. As we mentioned above, the NIMH batteries have a higher initial cost than alkaline batteries. Consumers can expect to pay around 29 dollars for a 15 minute quick charger and 4 AA NIMH batteries included. Keep in mind you get 750 to 1000 recharge cycles with that purchase. A pack of alkaline batteries will cost you almost 5 dollars a pack. So you can recharge your NIMH batteries 5 times and you get your money back on the alkaline batteries, and still have 750 to 1000 recharge cycles left! The NIMH batteries are also good for the environment because they have no cadmium in them as opposed to NICAD.
EDIT: Customer Service at Sentry Safe recommends Duracell or Energizer; see comment section
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