Fellow QRPers, I'm trying to get better battery life out of my portable setup. My KX2 seems to drain my 4400mAh LiFePO4 pack much faster than expected - maybe 3-4 hours of casual CW operation on 20m. Meanwhile, my friend's G90 runs all day on similar power. Any tips on optimizing current draw? I've turned off the display backlight and lowered RF gain when possible, but wondering if I'm missing something obvious.

Planning some POTA activations this spring and want to maximize my operating time!

The smaller batteries can last longer between charges with QRP rigs, but efficiency varies a lot between models. Try checking your actual current draw with a meter - you might be surprised. Also consider the KX2's DSP is pretty power-hungry compared to analog designs.

I had similar issues until I realized I was leaving the KX2 in CWT (Computer World Time) mode which keeps more circuits active. Also, even the smaller batteries can last longer between charges if you're careful about transmit duty cycle. Try 3 watts instead of 5 - often makes no practical difference on receive end.

The G90 uses a more efficient final amplifier design - that's probably the main difference you're seeing. A solar panel can be a good investment, especially if you like to camp. You can use it to charge your battery or even run the rig while the battery is charging. Worth considering for longer activations!