Energizer Battery FAQ

Why is mixing batteries of different chemistries, brands or age a potential problem?

Mixing of battery types (different chemistries, brands and/or fresh vs. used) in a device is not recommended and can significantly increase the potential for leakage and reduced device run time. The primary concern is an imbalance in capacities or available energy between the installed batteries. As the weakest battery becomes exhausted, it will be force discharged by the stronger batteries to very low or negative voltage levels which drastically increases the potential for leakage.

What type of batteries can be recharged?

Only batteries that are labeled as rechargeable are capable of being safely recharged. Attempting to recharge non]rechargeable batteries greatly increases the potential for leakage and rupture. Charging must be conducted in chargers specifically approved for each product type which may vary depending on brand and model of both battery and charger.

How can I test batteries to see if they’re still good?

A battery tester (loaded voltmeter) is a simple and effective way to determine if a battery is “good” or “bad”. Most testers place an appropriate load on the batteries and then read the voltage. A voltmeter without a load can give very misleading information and is not recommended for this purpose. Note that testers are typically not capable of providing reliable run time estimates.

What is the difference between carbon zinc and alkaline batteries?

The term Super Heavy Duty (SHD) refers to the zinc chloride carbon zinc system.Alkaline batteries are a premium product where as Zinc batteries are best suited for low drain applications such as clocks and simple smoke alarms or short intermittency devices such as remote controls.

Are there potential dangers or safety issues carrying loose batteries in a purse or pocket?

Yes, batteries can be short]circuited by metal items such as coins, keys, paperclips etc. A battery that is subjected to a short circuit can become very hot and increase the potential for leakage and personal injury.

How long will my batteries last in a device?

There are several factors that impact length of service or run time. The most important aspect is the rate at which the device consumes power. A high drain device such as a digital camera will deplete a battery faster than a low drain device like a clock. Other factors affecting overall battery performance are environmental conditions, device usage patterns (continuous or intermittent) and battery size/chemistry.

Rechargeable Batteries

What is memory effect?

This is a loss of battery capacity due to partially discharging and recharging repetitively without the benefit of a full discharge. This was evident with early nickel cadmium (NiCd) rechargeable batteries and is not found in nickel metal hydride batteries (NiMH) currently manufactured.

What is the difference between nickel cadmium and nickel metal hydride batteries? ↑

Both types of batteries are rechargeable but NiMH batteries have a higher energy density (ratio of energy to volume). NiMH batteries are also considered more environmentally friendly than NiCd batteries.

How long will a nickel metal hydride battery hold its charge?

When not in use, nickel metal hydride batteries will lose 20% to 50% of their charge within six months due to self]discharge. Several factors such as cell size, construction and storage temperature can impact the self discharge rate. NiMH batteries that have not been used for an extended period of time should be recharged before being put into use to obtain maximum performance.

Can I use an old NiCd charger with new NiMH batteries?

It is not recommended since the older NiCd chargers were not designed for the higher capacity NiMH batteries.

Why do batteries become warm when charging?

It is normal for batteries to become warm during the charge cycle. This is caused by the energy the charger is putting into the battery. In general, the shorter the charge time, the warmer the batteries will become.

Do NiMH batteries need to be charged when first used?

Yes, NiMH batteries are shipped in a discharged state and need to be charged before use.

Can a NiMH battery be overcharged? ↑

NiMH batteries are sensitive to continuous over charge. A smart charger monitors the cell condition during charge and prevents overcharging andsubsequent negative impact on battery cycle life.

How many times can I recharge nickel metal hydride batteries?

In normal use, NiMH batteries can be recharged hundreds of times. Many factors effect cycle life. Some of these factors include depth of discharge, charge and discharge current, method of charge control, storage and operating conditions and shelf life. Typically batteries with a higher mAh capacity will have a lower cycle life than lower mAh capacity batteries.

Can batteries of different capacities be used together?

No, it is recommend that batteries of different capacities not be mixed together. Mixing batteries of different capacities can result in lower than expected performance and reduce cycle life of the lower capacity battery.