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Another one here prefers K1 over other generations (except DX).
The K1 battery life gets very very bad when the wireless is on (much much worse comparing K2 and K3, just if you wonder.) 2500 pages sound good, the battery is in good condition. I don't know about aftermarket battery; 6 months ago, I bought 2 new original Amazon batteries, they don't hold power well - I read somewhere, batteries once charged, they need to be charge once a while; if not, their life will be shorten. You can ask aftermarket battery sellers, they might know the manufacture date on those battery; some can even roll a new one for you.
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