Lithium Central Heating Controller Battery (for more recent models of Honeywell ST699B, ST699, ST799 etc)

Type: Lithium Ion. Voltage: 3.0 V. Capacity: 7 or 8 mAh.

Original battery:    Diameter: 9.5 mm. Thickness: 2.0 mm.

Replacement battery:    Diameter: 12.5 mm. Thickness: 2.0 mm.

Price: £7.99. Postage and packing included.

Construction: Single cell with pins for horixontal mounting. Pins in correct positions to fit Honeywell PCB.

Comments:
The disc shaped Central Heating Controller Battery is widely used in Honeywell timer units such as recent models of Honeywell ST699B, ST699, ST799 etc. 

This coin-cell Central Heating Controller Battery with pins is suitable for more recent models of Honeywell ST699B and ST799 central heating programmer. But take a look before ordering as earlier models feature an oval shaped 3/V150H Central Heating Controller Battery and even earlier versions use the 3/V100DKO or 3/V100DK0. if your controller takes one of these larger 3.6V battery then take a look here.....

The old battery, as shown in the photo above, must de de-soldered and removed. The replacement battery will fit the existing holes in the PCB and needs to be soldered in place. The replacement cell is slightly larger than the original, but there is plenty of space for it. Needless to say, soldering skills are needed in order to replace the Central Heating Controller Battery.