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PP3 - UltraLife 9V Lithium Battery
A 9 volt PP3 lithium battery which can be used in smoke detectors and remote controls. Will last up to 7 times as long as the same alkaline battery but only costs a little more than twice as much as an alkaline PP3.
The PP3 size battery is also known by the codes: PP3, K9V, KA9, BLOC, LR22, MN1604, CLR6, ND65V, 1604AU, 6LR61, 9V, X22, 1604, 4022, 6F22, 0068, A1604. The Ultralife lithium PP3 battery would be a suitable longer lasting replacement battery for any of these.