No.
First of all, we need to clarify one concept, that is, lithium battery charger and cell phone charger are two different concepts.
Lithium battery charger refers to a power adapter that directly charges lithium batteries and stops when full (built-in lithium battery overload protection circuit). Its output voltage is n times the maximum voltage of a single lithium). battery. . For example: the maximum voltage of a lithium battery is 4.2 V, then the output voltage of the charger is 4.2 V; the maximum voltage of two lithium batteries in series is 8.4V, then the charger requires 8.4V and so on.
Mobile phone chargers are usually 5V power supplies. This is just a regular power adapter. It's just a usual name for people and it's not a real lithium battery charger.When charging a mobile phone, a lithium battery charging circuit is integrated into the motherboard of the mobile phone; If a basic charger or universal charger is used, then they have a built-in lithium battery charging circuit. The maximum voltage of cell phone batteries is generally 4.2V, so they can output 4.2V after using 5V power through the charging circuit.
Second, you made a mistake on the lithium battery charging voltage. The lowest rated voltage of a lithium battery is 3.7V (or 3.6V), but its maximum charging voltage is 4.2V. It requires a charging voltage of 4.2V .If the 7.4V lithium battery is two lithium batteries connected in series, an 8.4V lithium battery charger is required. But it is not enough to simply change the 10V power supply to 8.4V. It is also necessary to add a protection circuitection that stops when full to prevent the lithium battery from overcharging and exploding.
Can I use an 8.4V power supply to directly charge a 7.4V battery?
No. The 12V charger is supposed to be for lead-acid batteries, which don't have the same charging mode as lithium-ion batteries, so it won't work.
Actually, 3.6 (3.7) V batteries are connected in series. The actual voltage is 7.2 V.
Generally divided into: 1, 2, 3, 5, 7, of which 5 and 7 are particularly commonly used. The so-called AA battery has 5 batteries, while the AAA battery has 7 batteries. AA and AAA are battery models. The specific model is as follows:
1. Cell D (large cell/LR20/AM1) diameter ф34.2 height 61.5 mm;
2. Type C battery (2 batteries/LR14/AM2) diameter ф26.2 height 50.0 mm.
3. AA battery (5/LR6/AM3 battery) diameter ф14.5 height 50.5 mm.
4. AAA battery/LR03/AM4 battery (7)diameter ф10.5; height 44.5mm.
5. Type AA/2 battery (8 cells LR1/AM5) diameter ф11.0 height 30.0 mm.
6. Battery type AAAA (battery/LR619/AM6) diameter ф8.0; height 39.5mm.
7. AAAA battery/type 2/LR619/AM6) (small diameter ф8.0; height 28.0 mm.
Detailed information:
Battery classification:
1. Dry battery is also called manganese-zinc battery The so-called dry battery is related to the voltaic battery, and the so-called manganese-zinc battery refers to its raw material. nickel-cadmium batteries and other materials The manganese-zinc battery voltage is 15 V. Dry cells use chemicals to produce electricity. The voltage is not high enough to produce any more. of 1 amp of direct current
2.lead
The battery is one of the most used batteries. Use a glass or plastic jar, fill it with sulfuric acid, then insert two lead plates, one is connected to the positive terminal of the charger, the other is connected to the negative terminal of the charger, after more ten hours of use. under charge, a battery is formed. There are two volts between its positive and negative terminals. The advantage of batteries is that they can be used several times.
In addition, as its internal resistance is very low, it can provide a significant current. Use it to run a car engine, and the instantaneous current can reach more than 20 amps. When a battery charges, it stores electrical energy and when it discharges, it converts chemical energy into electrical energy.
3. Lithium battery
Battery with lithium as negative electrode. This is a new type of battery with highenergy developed after the 1960s. According to the use of different electrolytes: high temperature molten salt lithium batteries, organic lithium batteries, non-aqueous inorganic lithium batteries, solid lithium batteries, lithium water batteries.
Hello! It can be connected to charge, but we can calculate it. The output current of 8.4V is 1A. It is very likely that it cannot fully charge a 7.4V battery with a current of 3A. , and 7.4VX3A =22.2W But they have a difference in potential. 8.4V is higher than 7.4V, so it can be charged at 7.4V. Also, if you do this, pay attention to the charging time. . Ideally, this 7.4V 3A battery should be charged with a 7.5V power adapter with an output current greater than or equal to 3A. THANKS !