DataMates manufactured before 2009 were supplied with a Sonnenschein A206-6.5S battery. DataMates manufactured from 2009 are supplied with a EnerSys NP7-6 battery.
We switched to the EnerSys NP7-6 battery because the A206-6.5S batteries are now difficult to obtain. They will become completely unavailable sometime in 2010.
If you must replace an older Sonnenschein battery, please ask us if we have any in stock. If we do not have any in stock, then we can supply the EnerSys NP7-6 battery. You will also need to buy a new battery bracket, since the EnerSys battery has a differerent size and shape. Note that the combined cost of the battery and the bracket is not much different from the cost of the Sonnenschein battery by itself.