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all are compatible, the difference for the end-user is the run time
1.x, 2.2, 2.5 is just the amp-hour rating of the battery, it is a matter of x.x amps provided for x hours without dropping below x volts
think of car battery rating as: 12V battery rated as 20AH, it can provide 20A for 20H and maintain a V of 10.5 at the time period