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Old 2007.05.02, 03:45 PM   #1
shuter
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Join Date: Feb 2006
Posts: 387
C-9000 / BC-900 comparison

The following is a very complete feature comparison I found on another site:

There are similarities between the C9000 and the BC-900, however there are some differences as well.

Let’s try a feature by feature comparison…

Size: The C9000 is roughly twice the size of the BC-900. Cells are easily accessed on the C9000 due to the generous spacing between cells. Cells are harder to access on the BC-900.

Power: The C9000 operates from either 100-240V 50-60 hZ AC or 12V DC.
The BC-900 operates only from 100-240V 50-60 hZ AC.

Display: The C9000 display is roughly 30% larger than the BC-900, and is backlit. The font that is used to display the information on the C9000 is larger and easier to read. The BC-900 displays one set of information for all 4 slots simultaneously. To see other information, you need to press the display button. The C9000 steps through all of the information for each slot twice, then moves on to the next slot. It takes roughly 15 seconds to go through two display cycles, so it takes roughly 1 minute to go through all four slots. Pressing the slot button on the C9000 will display the capacity value for a slot with additional presses giving the capacity value of the next slot in sequence. The display on the BC-900 is faster to use, but harder to read. Both provide similar information.

Capacity: The C9000 has a capacity limit of 20000 mAh on the Break-In mode and 4000 mAh on charging modes.
The BC-900 has a capacity limit of 3000 mAh.

Charge rates: The maximum charge rate for 4 cells with the C9000 is 2000 mA.
The maximum charge rate for the BC-900 with 4 cells is 1000 mA.
The C9000 allows you to select charge rates of 200, 300, 400, 500, 600, 700, 800, 900, 1000, 1100, 1200, 1300, 1400, 1500, 1600, 1700, 1800, 1900, and 2000 mA.
The BC-900 allows you to select charging rates of 200, 500, 700, and 1000 mA for 4 cell charging, and additionally 1500 and 1800 mA for 2 cell charging in slots 1 and 4.

Trickle charge: The C9000 follows the main charge with a 100 mA top off charge for 2 hours, then supplies a 10 mA trickle charge. The top off charge and trickle charge rates are not displayed, and the trickle charge continues until the cell is removed.
The BC-900 is supposed to supply a trickle charge of about 5% of the charge rate selected. With a 1000 mA charge, it actually supplies around a 60 mA trickle charge. With a 700 mA charge rate, it trickle charges at around 40 mA. With a 500 mA charge, it trickle charges at around 28 mA. With a charge rate of 200 mA, it trickle charges at around 12 mA. The trickle charge rate is displayed, and the trickle charge continues until the cell is removed.

Temperature sensing: The C9000 uses a separate temperature sensor for each slot.
The BC-900 shares one temperature sensor for slots 1 and 2, and a second one for slots 3 and 4.

Discharge rates: The maximum discharge rate on the C9000 is 1000 mA.
The maximum discharge rate on the BC-900 is 500 mA.
The C9000 allows you to select discharge rates of 100, 200, 300, 400, 500, 600, 700, 800, 900, and 1000 mA.
The BC-900 allows you to select discharge rates of 100, 250, 350, and 500 mA.

Discharge mode: The C9000 discharges the cell down to 0.9 volts and stops. The discharge rate is selected by the user from the discharge rates available (default is 500 mA).
The BC-900 discharges the cell down to 0.9 volts and then charges the cell at twice the rate used for the discharge (default is 100 mA). EDIT: I have been asked to add that the BC-900 does not hold the discharge data. If you don't catch it before it starts charging, it is lost. ENDEDIT

Cycle, on the C9000 and Refresh, on the BC-900: These modes are similar, but there are some differences. Cycle on the C9000 prompts you for the charge rate (default is 1000 mA), the discharge rate (default is 500 mA), and the number of cycles you want to run (default is 1). It is capable of doing 12 cycles, and stores the mAh capacity for each cycle so you can go back and compare the different cycles after the process has completed. It starts with a charge, followed by a rest period, then a discharge once again followed by a rest, and finally a charge.
The BC-900 prompts you for the discharge current (default is 100 mA), then discharges the cell and immediately charges it at double the discharge current selected. There are no rest periods. This cycle continues until no further increase in capacity is estimated. The capacity during the last discharge is displayed at the end of this process.

Refresh and Analyze on the C9000 and Test on the BC-900: The C9000 prompts you for the charge rate (default is 1000 mA) and for the discharge rate (default is 500 mA). The cell is charged, followed by a rest period, discharged, followed by a rest period, and finally charged up again. The discharge capacity is displayed at the end of the process.
The BC-900 prompts you for the charge rate (default is 200 mA). The cell is charged, then discharged at half the charge rate, then charged again. There are no rest periods. The discharge capacity is displayed at the end of the process.

Battery condition check: When a cell is put in a C9000 slot and a charge rate is selected, a higher voltage will flash once during the display sequence. When this voltage is over around 2.0 volts, HIGH will be displayed indicating a damaged battery. When this voltage is around 1.7 volts, the cell will no longer be able to be charged on the 15 minute chargers because of higher internal cell resistance. Cells with very low internal resistance show up at around 1.45 volts.
The BC-900 also checks for battery condition. If the battery is within acceptable limits, it starts charging, if not, it displays NULL.

Warranty: The C9000 has a 3 year warranty.
The BC-900 has a 1 year warranty.

The C9000 has one additional mode, Break-In: When the Break-In mode is selected, the user is prompted for the cell capacity. The available capacities range from 500 – 20000 mAh in 100 mAh steps. The default is 2500 mAh. This mode follows the IEC standard for cell capacity testing. The cell is charged for 16 hours at a rate equal to one tenth of its capacity (0.1C), rested for an hour, discharged at a rate equal to one fifth of its capacity (0.2C), rested for an hour, then charged again for 16 hours at the 0.1C rate. The discharged capacity is displayed at the end of this process.

Cost: A quick check today revealed $62 - $65 for the C9000 and $36 - $70 for the BC-900.
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Old 2007.05.03, 01:01 AM   #2
herman
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Join Date: Nov 2001
Location: makati, philippines
Posts: 8,472
pretty cool comparison....
cool topic.... gets my vote for being a sticky...
herman is offline   Reply With Quote
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