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Amazon.com: 18650 Battery Charger, Smart Universal Charger, 18650 Battery Tester, mod Battery Charger,for 3.7V Li-ion TR IMR 10440 14500 16650 14650 18350 18500 16340(RCR123) Batteries(4Bay Not Battery)
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18650 vs. 21700 Li-ion cells – A direct comparison of electrochemical, thermal, and geometrical properties - ScienceDirect
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