MAHA C9000 Slot 1 always lower (part 2)

[viorel00]

I posted this a long time ago but I didn't have time to come back and post the results, and tonight I found the old paper where I wrote down these numbers and here is the story:

I took a set of 4 fresh eneloops. I did a few charge/discharge cycles on the MAHA C9000. I labeled them A, B C and D. Then I run a charge 1000 mA / Discharge 500 mA Cycle. After each cycle, I rotated the cell so that each cell was in each slot

so I did

ABDC
BCDA
CDAB
DABC

for each cycle, slot 1 shows a charge capacity of about 1820-1840 mAh, and slots 2 3 and 4 show about 1900-1920 mAh.

When I do a discharge cycle, all 4 slots show about the same capacity, about 1830-1850 mAh

I believe slots 2,3 and 4 work properly, and that slot 1 will discharge a battery properly and show the correct capacity, however, when it charges the cell, it shows about 80-100 mAh LESS than the real charge put into the cell.

The charger is still under warranty, should I bother to get it fixed/replaced?

 

[Burgess]

For what it's worth, mine is the same way.


Had it for 2 years now, and other than that little quirk,

it still performs GREAT !


I just (try) not to worry/obsess over that (minor) detail.


Works for me !



Your mileage may vary


_

 

[viorel00]

here is the answer from MAHA

Thank you for contacting Maha. Charging capacity tends to vary up to
10% between slots due to different battery temperature. By design slot #1 is
the coolest slot and therefore the charging capacity may be less than
others. However, this does not mean #1 is overcharged or undercharged.

On the other hand, the discharge capacity is not affected by this.

 

[Burgess]

Good Work !

:goodjob::thanks:

_

 

[viorel00]

yeah, I am not sure I buy that. I would understand is slots 1 and 4 were cooler (being at the side of the device) and slots 2 and 3 were warmer. but why is slot 1 cooler than slot 4?

I think they found an excuse so they avoid dealing with a repair.

 

[Turbo DV8]

The Maha 808 charger definitely has a "hotter" and a "cooler" side, the temperature increasing by a very substantial margin as you work your way left-to-right. Buy yourself a non-contact IR thermometer. It's a fun gadget that is actually very useful, and it would prove once and for all to you if Maha's claim about bay #1 being cooler is true or not. Aim the thermometer at each cell as they reach a few pre-determined common voltages, and then again as each is on the brink of terminating. That should show you if the claim is true or not.