Re: With increasing cycle count, individual cells are showing differences.
Cycle count agravates the differences, but the most common CAUSE is a failure
to FULLY CHARGE the series set of cells, so some of the cells never reach their
FULLY CHARGED voltage. Damage occurs during use as the cells
Hi Markus,
thanks for interesting info.
Discharge was with 100 mA.
I am using a TechnoLine BC-1000 charger. It handles the 4 cells
individually.
Max. charging current is 1.500 mA, discharge current max 500 mA - all
selectable,.
Seems to work quite well.
Per-Tore / LA7NO
On 9 May 2016 at
Per-Tore,
With increasing cycle count, individual cells are showing differences. If
you don't charge them individually, these differences are getting bigger, as
reflected by the numbers you posted.
You mentioned that you verified cell capacity using your charger. At what
discharge current? Most
Hi list,
and thanks for useful information.
I usually do not deeply discharge the cells. This was only for checking the
actual capacity at the cells before testing.
I just measured the voltage of the 8 cells, once with the KX3 off, once with
receiving with high volume. These are the results:
Another thing to check is corrosion resistance at the battery
contacts. I find this problem frequently with flash LED
head-mounted lights.
When I have a problem like this, I like to measure the cell
voltages under load. You may be able to run the KX3 into a dummy
load at the 0,1W tune
Also using LSD (Eneloop standard) cells and non-transmit voltage reads 10.4V
even after several months of no use.
--
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I think you will find that one of the cells used in this series
arrangement will have a high internal resistance. You also mentioned a
brand that I have seen the worst performance from (my personal
experience). I have been using one of the Blue ESR meters (80 bucks)
for about 4 years to look at
"new" pack in the unit will never get cycled just topped up.
73's Peter VK4JD
-Original Message-
From: Elecraft [mailto:elecraft-boun...@mailman.qth.net] On Behalf Of LA7NO
Sent: Friday, 6 May 2016 8:07 PM
To: elecraft@mailman.qth.net
Subject: [Elecraft] KX3 internal battery problems
KX3 (ser. no. 08146) works OK on external power, but recently I am
experiencing problem using it on internal rechargeable cells.
The AA cells are relatively new Varta Professional No. 5706, 2700 mAh NiMH.
They have been charged with a techno-line BC-1000. Measured capacity via an
automatic
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