ER14505 lithium cell
Li-SOCl2 AA bobbin cell · 3.6 V flat until nearly empty · 2600 mAh · self-discharge about 1 %/year · made for years at microamps, not for pulses (about 15 Ω inside) · 100 % left

Try it on the benchThe lab drops it on an empty bench and opens its datasheet card.
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