[Elecraft] KX3 internal battery problems

[hb9brj]

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 probably not at the 1.5A which the KX3 draws when
transmitting.

While powering my KX3 with 8 internal Eneloop cells and varying output
power, I found a total internal resistance of 1.15 Ohms. A single Eneloop
cell showed 34mOhm (I have an instrument measuring Ri by applying short
discharge current pulses). In total, only 25% of the total Ri comes from the
8 cells. Battery holder and wiring are responsible for 75%.

73, Markus HB9BRJ





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