Yes, but a resistor must be connected in series.
Mobile phone lithium battery: Mobile phone lithium battery is mainly composed of upper and lower plastic shells, lithium batteries, protective printed circuit boards (PCBs) and resettable fuses ( polyswitch). Some manufacturers also configure components such as NTCs, ID resistors, vibrating motors or charging circuits. Lithium batteries are durable goods, so they are not delicate. You can treat them with peace of mind and there is no need to equip them with expensive original chargers. Generally, an ordinary branded base charger is enough, and the price is 15-20 yuan, which eliminates the restriction of relying on mobile phones for direct charging.
LED lamp bead: LED is (light emitting diode) in English. The LED lamp bead is the abrEnglish eviation of light emitting diode, abbreviated as LED, which is a popular name.
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Hahaha, I'm also very brave:
The "bulb" mentioned by the poster is a white LED (the core of the tube is a light-emitting semiconductor blue diode coated with white phosphor), its normal operating voltage drop is 2.9 to 3.2 V.
The bulbs mentioned by the poster are connected in parallel, so the battery is usually powered by 3 nickel-metal hydride batteries in series (3.6-4.5 V) or a single lithium battery (3.6-4.2 V). .
Regarding charging, in order to ensure battery life, the nickel-metal hydride battery should be charged at a constant current, and the thermistor used in the sensor is turned off when it is fully charged. (The nickel-metal hydride battery will generate heat whenwill be fully charged).
Lithium batteries are only used in very few high-end lightweight flashlights. Lithium-ion batteries are charged at constant voltage (or constant current first, then constant voltage), and the charging voltage at shutdown is 4.20 V.