1.2V NiMH batteries

　　Can a 1.2V NiMH batteries be used with a 5v charger?

　　Q1: Can a 1.2V NiMH batteries with a protective plate be charged with a 5v charger?

　　The functions of the protection board are discharge over-current protection (preventing the battery discharge current from exceeding the discharge capacity), discharge low-voltage protection (preventing the battery from over-discharging), and charging over-voltage protection (charging to 4.2V to shut off the connection between the battery and the outside). When charging directly with 5V, a resistor must be connected in series, otherwise the battery overvoltage protection may immediately cut off the connection between the battery and the power supply, making charging impossible. Although the series resistor can be charged, if the battery protection circuit is unreliable, the battery may be damaged. It is best to charge with a charger, so that the two-level protection (the charger will limit the maximum charging voltage) ensures the safety of the battery.

　　Q2: Can a 1.2V NiMH batteries be used with a 5V output USB charger?

　　It can be used for short-term emergency use, but long-term use will cause battery damage, because the 5V output USB charger has a higher voltage than the 1.2V NiMH batteries, and long-term use will cause battery damage.

　　Note: The battery has a specified maximum voltage and current. If the maximum voltage or current is exceeded, the charger will be damaged.

　　Q3: Will charging a 1.2V NiMH batteries with a 5v 0.7mA charger be harmful to the battery? Thank you.

　　Dear, the answer is definitely not possible~ If a battery with a standard voltage of 3.7V is charged with a 5V power supply, the battery electrode grid will break down, causing overcharge and a short circuit. In severe cases, the battery will spontaneously ignite and explode~ Generally, the battery must be charged for a certain period of time. Use the corresponding or original charger and power supply to prevent the battery from overcharging, overheating and causing bulging, leakage, short circuit and explosion~ It is strongly recommended that you use the original charger to charge the battery. If the original is damaged, it is recommended that you go to the relevant digital store to purchase a matching set Charging equipment to ensure the safety of the battery and your consumption ~ Please be aware of the above and please ask if you have any questions ~

　　Q4: Can a 5v charger be used for a 1.2V NiMH batteries?

　　It is okay to charge for a short period of time or temporarily, but do not use it frequently. It is safest to use a charger with a voltage of 4.2V.

　　Q5: Can a 1.2V NiMH batteries with a protective plate be charged with a 5v charger?

　　Charging lithium batteries is very dangerous. If nothing else, overshoot will at least greatly reduce the service life and performance of lithium batteries. It is possible to use a 5V power supply to charge lithium batteries. Lithium batteries with protective plates have the ability to prevent overcharge.

　　The protection board itself is a function of comparing voltage to charging current. However, directly using this method to charge lithium batteries can easily lead to insufficient charging and damage to the battery. The reason is that lithium battery charging is not linear, but a curve. Smart chargers will charge lithium batteries with different currents under different circumstances.

　　Without this kind of intelligence, it can only rely on the voltage of the protection board, which is difficult to control. In battery charging, the voltage comparison method is the roughest method to measure whether the battery is fully charged. Therefore, there is no problem in charging this way temporarily. Using this method for a long time will cause the lithium battery to be scrapped early. Lithium battery expansion and other consequences. If this charging method is used on a lithium battery without a protective plate, it will cause an explosion.

　　Extended information

　　The function of the protection board is discharge over-current protection, which prevents the battery discharge current from exceeding the discharge capacity, discharge low-voltage protection, which prevents the battery from over-discharging and charging over-voltage protection, and charges to 4.2V to shut off the connection between the battery and the outside. When charging directly with 5V, a resistor must be connected in series, otherwise the battery overvoltage protection may immediately cut off the connection between the battery and the power supply, making charging impossible.

　　Although the series resistor can be charged, if the battery protection circuit is unreliable, the battery may be damaged. It is best to charge with a charger. With this two-level protection, the charger will limit the maximum charging voltage to ensure battery safety.

　　Q6: Can I use a 5V charger and connect a diode to a 1.2V NiMH batteries?

　　It should be possible because the diode has a voltage drop of 0.7V and the general battery voltage is 2.7V and the limit voltage is 4.2V.

　　Q7: How to charge 1.2V NiMH batteries with 5v 1a charger

　　If there is a protective board, you can add a rectifier diode and it can be charged!

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