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Where can I get a replacement battery for a Randall 702?

Where can I get a replacement battery for a Randall 702?
The battery in the 702 programmer is only used to hold the programmed settings during a power-cut. If there is a power-cut you will have to re-programme the unit. The Varta 600DK battery is no longer available. Varta stopped manufacturing it 10 years ago, and we cannot source a replacement manufacturer.
The following Danfoss controls are standard battery powered models. They all take 2 x high quality alkaline AA size batteries - TP5000, TP7000, HC6000, WP75-RF and RET-B.
 
For further assistance please contact out Technical Support Helpline on 0845 1217 505.

<b>Did you know....</b>

Did you know....
... that 100 kg of CO2 emission can be saved annually by replacing a manual radiator valve with a thermostatic radiator valve?