AA battery holder (3 x AA).
Can be retrofitted to existing TankMate v2 units - as an alternative to the C-size lithium battery. Typical lifespan: 12 months (with 3 x Alkanaline batteries)
 
Can be used with the following battery types (not included):
	
	
AA Alkaline 1.5V - (NOT the heavy duty type)
	
	
	
AA NiMH (rechargeable) 1.2V