TLH-5902 - Tadiran 1/2 AA 3.6V Lithium Battery provided by AtBatt.com
Amazon.com: Fitinoch 6 Pack Rechargeable 14250 Battery with Charger, 3.7V 1/2 AA Lithium Batteries Can Replace 3.6 Volt LS 14250, ER14250, CR14250 Disposable Battery for Laser : Health & Household
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Amazon.com: 2 Pcs 3.7V Rechargeable Batteries 1/2AA Lithium ion Battery icr14250 300mAh (Flat Top, 0.57 * 0.98inch, Shorter Than AA and AAA : Health & Household