Powertech 800 Ni
The Doc’s Battery Test Report
Battery Details
Brand
Powerech 800
Size
AAA
Type
Ni-MH
Current in mAhs
800
Stated Voltage
1.5 volts
Number of batteries
Single
Battery Set used
Set 1
Times charged before test started
11
Charger used to charge
Rezap RBC883
Time Batteries charged in charger
See UBA graph.
AA
C
Ni-Cd
D
9V
RAM
6V
Alkaline
Titanium
1.2 volts
Set of 2
Set of 4
Vanson Speedy Box
UBA4
Test Procedures
Spreadsheet name
Powertech800NiMH-AAA-Set1.123 (Discharge data file)
UBA file name
Powertech800NiMH-AAA-Set-11.uba (Charge file)
Select Resistance 5 or 10 ohms
5 ohms
Voltage cut off
3.5 volts
Date of test
11/12/03
10 ohms
3.6 volts
Summary of test
Voltage
Starting voltage 5.4 volts, cut off voltage 3.6 volts
Test duration
89.55 minutes
Max Battery Temp
32.2 degrees Celsius
Min Battery Temp
29.9 degrees Celsius
Methodology
The battery set being tested has been charged at least 5 times. The battery set is charged in a
Universal Battery Charger (UBA4). It is then tested under a load of 10 ohms in the scientific
dooverlackie (the AA batteries are tested at 5 ohms). In this test the battery set was also
charged in several different types of charger. The Doc has created a charge cycle specifically
for test purposes. The UBA4 runs a peak charge cycle, once completed the battery set is
automatically put on a trickle charge for 6 hours. The following pages give various data,
including:
1. charging information from the UBA4;
2. a graph of the voltage during the test (cut off voltage being 3.6 volts);
3. a graph of the battery temperature during the test;
4. a graph of the battery temperature verse ambient air temperature during the test; and
5. a graph comparing the charging performance of different chargers with the Powertech
800's.
Michael G Hains © 2003. This Report (including all data) not to be used or reproduced without permission.
1
The Doc’s Battery Test Report
UBA report
The graph and charging information from the UBA4.
Michael G Hains © 2003. This Report (including all data) not to be used or reproduced without permission.
2
The Doc’s Battery Test Report
Voltage graph
Powertech Ni-MH 800 AAA (set of 4)
6
Volts
5.5
5
4.5
4
3.5
Time 89.55 minutes
UBA4
Battery temperature graph
Powertech Ni-MH 800 AAA (set of 4)
32.5
Celsius
32
31.5
31
30.5
30
29.5
Time 89.55 minutes
Battery Temp
With AA batteries the battery temperature rises as the battery discharges more energy. The
relationship is not so clear cut with AAA batteries, probably due to the batteries being less
powerful and the load being 10 ohms rather than the 5 ohms used for AA's.
Michael G Hains © 2003. This Report (including all data) not to be used or reproduced without permission.
3
The Doc’s Battery Test Report
Battery temperature -v- Ambient air temperature
Powertech Ni-MH 800 AAA (set of 4)
33
Celsius
32
31
30
29
28
27
Time
Battery Temp
Ambient Temp
Charger comparison
The Powertech 800 battery set was then tested in various battery chargers to compare charging
performance. Here are the results:
Powertech Ni-MH 800 AAA (set of 4)
6
5.5
Volts
5
4.5
4
3.5
3
Time
UBA4 90 minutes
Rezap (lower) 72 minutes
Maha C204F 82 minutes
Speedy Box 84 Minutes
Powerbase C-T3 82 minutes
Michael G Hains © 2003. This Report (including all data) not to be used or reproduced without permission.
4
The Doc’s Battery Test Report
To simplify the graph legends, The Doc has rounded the run times up to the next full minute.
The performance between the 5 chargers is more varied than with the Energiser 750 Ni-MH.
While the UBA4 and Speedy Box perform well, the Maha and Rezap are not as effective. But
the variation is not that great to draw any real conclusions. In these tests all chargers started at
the highest voltage and went down. In contrast, the Speedy Box - when charging the Energiser
750's - started at a lower voltage then peaked and then went down like the other chargers. This
peculiar behaviour does not repeat itself here. It was the Powerbase that really stood out, not
because of the run time but the charge time. In less than an hour the Powerbase charged the
battery set and the set ran for 82 minutes – an extraordinary performance. And the batteries
remained cool during the charge.
There is little difference in build quality or performance between the Energiser 750's (Japan)
and the Powertech 800's (China). In AA size batteries, the Japanese brands are of superior
build quality.
Conclusion
The performance of AAA's batteries is not in the same league as their bigger brother, the
AA's. AAA's are used less often than AA's in both toys and high drain devices. AAA's are
common in remote controls where the power demands are lower. With these less power
hungry devices, the battery set is more likely to self discharge before being exhausted in use.
In the Doc's view, build quality and the number of recharges are more important than raw
capacity. The Powertech 800 mAh Ni-MH are a good all round performer. Neither the
Energiser 750's or the Powertech 800's have a clear advantage over the other.
Run Time (10 ohm)
89.55 minutes
Battery build quality
Good
Place of Origin
China
Cost (set of 4)
AUD$16.00
Report date: 27 December 2003. 21 January 2004 Added data for Powerbase C-T3 charger.
http://www.users.on.net/mhains/
thedoc@internode.on.net
Michael G Hains © 2003. This Report (including all data) not to be used or reproduced without permission.
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