Dyolfknip74
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Well, to be fair, lithium batteries will go from good to bad like a light switch but that has no bearing on this conversation.Here's the thing. Batteries aren't like a light switch that flip from "good" to "bad". They progressively lose their ability to maintain a voltage level. "Tested Good" means that it hasn't deteriorated below an arbitrary point where it's considered no longer useful. But it can be rather close to it and still be "tested good". It's guaranteed to be worse than your new battery.
That old battery will act like a vampire and suck the life out of the new battery until they are both equally bad. So if you replace one, always replace the other (in spite of it still being "good") so both batteries are always at equal levels of wear. That will maximize the lifespan of both batteries.
If you replace batteries individually, you will constantly be in a situation where one battery is stressing the other. You will go through a lot of batteries this way.
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