LS 14250: 1 - 2AA lithium battery, 3.6 V, 1.2 Ah at reichelt elektronik
Lithium-thionyl chloride (Li-SoCl2) battery pack features 3.6V Operating voltage and 1200mAh capacity in a small 1/2AA form factor with Molex(2695) 22-01-3027 (2 pin) Termination, BS1200C1425001S1PCMW | GlobTek
Eve ER14250 1/2AA 3.6V Lithium Battery Energy very endure Bobbin Cell Size NEW | eBay