Replacement battery for TankMate WiFi v2 products (blue circuit board).
Primary lithium battery - lifespan up to 3 years.
 
Note: this is a customised 3.6v Li-SOCL2 battery - please check with us before using a substitute battery on your v2 unit.
 
All v1 TankMate units (green circuit board) use 3 x AA alkaline batteries