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Q: What does Ni-MH mean?
A: Ni-MH stands for Nickel-Metal Hydride.
Q:What is the shelf life of a NiMH battery?
A: You probably mean to ask: What is the self discharge rate of a NiMH battery? The rate of self discharge for any battery depends on the temperature at which it's stored.
Stored at 70 degrees F (20 C) NiMH batteries will lose up to 40% of their charge within a month. If they are stored at a higher temperature, they will self discharge at an
even higher rate. NiMH batteries stored at a lower temperature self discharge at a lower rate (Self discharge chart available soon).
Q: What is Memory Effect?
A: Memory Effect on a battery is the loss off run time per charge over the life of the battery. To avoid Memory Effect and attain maximum performance discharge battery
completely each use. Nickel-Metal Hydride has no Memory Effect and can be charged or topped-off at any time without affecting battery life.
Q: What is the difference between Nickel-Metal Hydride and Nickel Cadmium batteries?
A: 1).Nickel-Metal Hydride (Ni-MH) batteries provide up to 200% more power than Nickel Cadmium (Ni-CD) rechargeable batteries, will significantly outperform
alkaline batteries,in most digital applications and will greatly outperform Ni-CD batteries in high-drain applications.
2).Ni-MH batteries have a rechargeable life of up to 1000 cycles, 25% more than Ni-CD.
3).Ni-MH batteries have no Cadmium added. Cadmium is hazardous to the environment.
Q: Are there any points to be careful of when storing Ni-MH batteries and Ni-Cd batteries?
A:The properties of Ni-MH batteries and Ni-Cd batteries are different. To get the best use and logest life from your batteries, you should store Ni-MH batteries fully charged and should store Ni-Cd batteries fully discharged.
Q: The batteries get warm during charging. Is this okay?
A:Yes. The batteries will get warm during charging but will cool quickly after recharging. This is a normal occurrence and no cause for concern.
Q: Why shouldn't you mix old batteries with new ones?
A:The performance of a battery-operated product is limited by the weakest of all the batteries in the device. One old or weak battery can cause poor product
performance even if all the others are new or fully charged.
Q: Can batteries be charged continuously?
A:Yes. But it depends on the designs of different chargers. Theoretically, if the charger’s charging rate is as low as 0.1C, NiMH batteries can be charged continuously.
Q:How does charging, discharging or storage impact the life of rechargeable batteries?
A:Rechargeable batteries are affected by:
1) Charging:
- Choose a smart charger that can automatically shut off under different condition (e.g.when batteries are fully or over charged at negative voltage and overheat). In general,
charging at a low rate helps extend the service life of batteries than using a rapid charger.
2) Discharging:
- Depth of discharge (DOD) affects the service life of batteries significantly. The higher the DOD, the shorter the service life of the batteries, and vice versa.
Therefore, you should avoid over-discharging batteries to extremely low voltage. Depending on the discharge voltage, the acceptable terminal voltage
ranges from 0.8V to 1.0V.
- Discharging batteries under high temperature will shorten service life
- If the electronic device does not stop all discharge current (e.g. standby current), leaving batteries inside the device for too long can lead to over-discharging.
- Using a combination of old and new batteries or of different capacities, chemical structures and charge status can result in over-discharging, or even reverse charging.
3) Storage:
- Storing batteries in very warm places for an extended period of time reduces service life.
- Avoid inserting batteries in a charger for too long .
Q:How to get a better life out of the batteries?
A:To help extend the life of the batteries, you should:
- Turn off battery-operated appliances when they're not in use
- Store the batteries in a dry and ventilated place at normal room temperature without direct sunshine; For long-term storage, the room temperature should be below
30 degrees Celsius; Do not use or charge batteries under extreme temperatures
- Charge the batteries using suitable chargers and prevent overcharging; Use charger with a voltage sensing capability; Choose packages that include both the batteries
and the charger
- Charge and discharge batteries occasionally to avoid the voltage falling below 0.8V
- Remove batteries from devices that won't be used for an extended period of time
- Avoid overcharging by following the charging time stated by the battery manufacturer
- Not to use a combination of mixed batteries of different chemical structure, capacity and energy level
Q:How should a NiMH battery be stored?
A:In general, the higher the temperature, the easier the NiMH battery loses its charges.
Q: Whether E&J NiMH batteries can work replacement for Panasonic/Sanyo NiMH batteries, GP NiMH batteries, Energizer NiMH, VARTA NIMH?
A: Yes. E&J NiMH batteries cover cylindrical, prismatic, button ones and they can work very good replacement for the other brand NiMH batteries like Panasonic/Sanyo/GP/Energizer/Varta/Saft/Rayovac/Philips.
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