①. Regarding the nickel-cadmium battery above, can it be charged with a lithium battery charger?
②. It is recommended for the above-mentioned nickel-cadmium battery not to use a lithium battery charger to charge the nickel-cadmium battery. The reason is that nickel-cadmium. Cadmium battery charger and lithium battery charger. The internal structure and circuit design are different, so for the above nickel-cadmium batteries, you can still choose a nickel-cadmium charger to charge the nickel-cadmium battery.
Is it acceptable to replace the shaver's nickel-metal hydride battery with a lithium battery of equal voltage?
No.
1. The voltage of the nickel-cadmium battery is 1.2 V or more. 2. The lithium battery is 3.7V, the voltage difference is too large. This will damage the nickel-cadmi batteryum.
If the voltage difference is too large, the charger may fail to produce or charge, which will also affect the battery life.
There is certainly no problem using them because their voltages are the same.
But pay attention to the load. The capacity of nickel-metal hydride batteries is generally more than twice that of nickel-cadmium batteries, and the charging time should be twice as long.
But the key is knowing what your shaver's charging circuit is. If it is fast charging and stops automatically, it may not work because the fast charging circuit in nickel-cadmium batteries senses the voltage drop after charging. The battery is fully charged and stops charging. However, if the nickel metal hydride battery is fully charged and there is no voltage drop, charging will continue and the battery will enddamaged.
It would be easier if it was a normal regular charge, just double the charge time
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< p>Don't tell me down there that it definitely won't work. There are many types of battery charging circuits. What if the current is constant for a few hours and it doesn't work? Is it possible to extend the charging time?===========================
Ah, that will be easy
< p>This is the simplest balanced current charging. Look at the milliamp hours of the old battery, then look at the milliamp hours of the new nickel-metal hydride battery. Just add the charging time proportionally.For example, if the original nickel cadmium is 700 mah, if the newly purchased nickel metal hydride is 1400 mah, the charging time should not exceed 16 hours, s it is 2100 mah, the charging time must not exceedr 24 hours. , And so on. Of course, for insurance reasons, the time can be shortened appropriately to avoid overrun. The biggest you can usually buy now is 2500mah