We have different solutions and all with extremely long battery life time up to 10 years with 2 daily positions.
Please check our industry models EPS2, 5 and 8 on www.microtracker.dk
EPS2: using 3 pieces AA alkaline batteries. Last for up to +2000 positions
EPS5: build-in lithium cell will last for up to 8000 positions
EPS8: comes without battery and needs lithium battery