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Battery Information
Battery Questions and Answers
What does the term memory effect mean?
It means a battery can "remember" how much
discharge was required on previous discharges.
How do batteries get memory effect?
Memory effect results from radio users who do not fully discharge their batteries after each use.
What causes memory effect?
Cadmium crystals, in the cell, grow very large reducing the cell plates surface which causes a voltage depression.
(This chemical reaction limits the operating time a radio
user gets from their battery.)
Can memory be "reversed"?
Yes, in most cases. By discharging and recharging the battery multiple times if required. (Depends on the severity.)
Can memory be irreversible?
Yes. Cell chemicals will "dry out" in batteries which have
not been fully expended and continually overheated.
(This battery can be permanently damaged.)
When can memory effect begin?
Memory effect can begin in 2-3 months, following initialization. (Depends on the number of charge
and discharge cycles.)
How can memory effect be avoided?
By using all of the batteries capacity before
recharging it.
Can a NiMH battery get memory effect?
Yes, but to a much lesser degree.
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Battery Type Chemistry Comparison
| Type |
NiCad |
NiMH |
LiIon |
| Operation Time |
8 hours |
12 hours |
12 hours |
| Number of Cycles |
600-800 |
300-350 |
400-500 |
| |
(700 avg) |
(325 avg) |
(450 avg) |
| Operating Hours |
5600 hours |
3900 hours |
5400 hours |
| Temperature |
-30°C |
-20°C |
-10°C |
| Memory Problems |
Yes |
Minimal |
No |
| Resistance to Heat |
Most |
Least |
Circuit Protection |
| Requires Recycling |
Yes |
Advisable |
No |
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Performance
Choose a NiCd Battery if….
You operate your radio within
an 8 hour shift
You need a wide operating temperature range
Your users tend to overheat batteries
during charging
You can "live with" memory effect
You want the greatest value
Choose a NiMH Battery if….
You operate your radio for 10, 12 hour shifts or more
You use your radio indoors or in a warm climate
You utilize recommended rapid chargers
and follow charging procedures
You want to virtually eliminate
memory effect
You don't mind paying slightly more (per watt hour) than a NiCd for your battery
Choose a LiIon Battery if….
You operate your radio for 10, 12 hour shifts or more
You use your radio indoors or warm climate
You don't mind purchasing special chargers
You want to virtually eliminate
memory effect
Light weight is an important factor
Price isn't a large factor in your purchasing decision
Why buy Motorola Batteries?
Motorola commissioned an independent testing Lab to compare the construction and performance characteristics of Motorola Premium Batteries to other manufacturers.
Results….
| Charging Cycles |
| Motorola |
Competition |
| 600-800 cycles |
400 cycles |
80% capacity for
100 cycles
(average 253) |
80% capacity for
500 cycles
(average 700) |
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Talk Time
Tests Show that on average Motorola Premium NiCd Batteries Have:
- Up to 10% More Capacity at Room Temperature than Standard Batteries
- Up to 80% More Capacity at -20C than Standard Batteries
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Drop Test
Average Number of Drops to Electrical Failure
| Battery Supplier |
Drops |
| Motorola |
130 |
| Competitor #1 (premium) |
26 |
| Competitor #2 (standard) |
12 |
| Competitor #3 (standard) |
16 |
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Why buy Motorola Original OEM Batteries?
- One Motorola Premium Battery is Equal to At Least 2.77 Standard Batteries
- Longer Talk Time Between Charges
- Longer Life
- More Rugged
- Optimum Performance & Reliability
- Cost Less to Operate
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