|KX2 and $36 Li-Ion battery|
So I took a $36 gamble to see if this battery offered a level of quality to allow it to serve as a viable alternative to Elecraft's $60 battery and their required dedicated $25 charger. The battery arrived from a warehouse in Arizona, well packed and with a connector that I cut off and will replace with a suitable barrel connector.
Like the Elecraft battery, this one is a 3-cell lithium-ion pack rated at 2600 mAH, fits easily into the KX2 and has protective circuitry built in. Unlike the Elecraft battery, this one doesn't require a dedicated charger and can be charged by any charger suitable for lithium-ion batteries.
|A perfect fit|
I couldn't help but buy one and test its rated capacity at an average discharge rate that I believe is comparable to a KX2 in heavy use. My KX2 draws 185mA on receive and about 2 amps key down with ten watts out. This means that a string of dits would draw a bit over an amp. Assuming we listen more than we transmit, I settled on 400mA as a discharge rate for this battery.
|Protection circuit is beneath the battery's heat-shrink material|
|Top of protection circuit|
The capacity of this $36 battery after 3 charge/discharge cycles is about 2400mAH at a 400mA discharge rate. I have no doubt thatif discharged at a lower rate, the capacity would meet the 2600mAH specification.