Lithiums show virtually no discharge on most beacons and then just die. The Beacon self test is designed to work with Alkilines.
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Whenever it hits 75% cold.
As cheap as batteries are, no sense in not keeping good ones in there.
Throw the "used" ones in a bucket and stick 'em in remote controls or toys.
Why no lithiums?
LiSOCl2 = Lithium Ion
Hard to predict how "charged" the battery is, and once it dies it dies -fast-.
Alkalines are easier to predict, and taper off slow enough that you will see the battery's discharged but still have enough energy to make use of the device.
Best thing about replacing them often is when the old lady finds the "Gone sledding for the weekend" note when she gets home, phones ya yelling I just say "Hey, i replaced the batteries in your vibrator before I left, WTF you need me for" ?