Use 8.4V-8.6V to charge. Your battery capacity is too small, only 180 mAh. The capacity remains unchanged once the batteries are connected in series, and lead-acid batteries can discharge large currents instantly. the discharge of 180MAH lithium battery is greater than 200MA If the potential is lowered to the over-discharge protection voltage, the protection board will be protected!
In addition, series connection of lithium batteries requires two cells to be connected in series and charged with a pulse voltage of 8.4 V. The ripple should not be too high. If the ripple is too strong (i.e. it is not a pulse), the battery cannot be charged. Yes. Including internal resistance, capacity and voltage
Can two sets of lithium batteries be connected in series?
Don't worry, it's very common for this to beatLithium battery is used in series and parallel, as in laptop computers.
Thanks to the protection board, there is no need to worry about overcharge, overdischarge or output short circuit when charging or discharging. dump.
There is only one thing to note: When making series combinations, be sure to choose battery cells with almost the same voltage and internal resistance, so that the duration Battery life can be extended to the maximum during repeated charging. and discharge in the future. The lifespan of the battery cells.
Because if the capacities of the corresponding batteries are inconsistent:
1. The small capacity will be fully charged quickly during charging, causing the overload protection circuit of the protection board to work and close the charging circuit. At this time, the battery cells of grande capacity are not fully charged and the overall battery capacity will be reduced;
2. over-discharge protection circuit of the protection board to operate and close the discharge circuit, and at this time, the large-capacity cells have not been discharged, and the amount of electricity released by the battery is also reduced ;
3. Due to small capacity cells, the capacity of the entire battery will change during use. It is determined by the minimum battery cell capacity, which significantly reduces battery and battery performance. The pack will become full as soon as it is charged and empty as soon as it is discharged.
4. Small capacity cells will be damaged over time due to long-term exposure to deep charging and discharging, and the entire battery will also be damaged.
Those withsame capacity can be used in series, but it is better to charge them separately because cell phone batteries do not have a balancing circuit. It is best not to use batteries of different types in series, because after the smaller capacity battery is exhausted, the other batteries are still charged, which will cause the small capacity battery to be reverse charged or over-discharged, causing the small capacity battery could be damaged! If you must use it this way, you can simply stop using it before the small capacity battery runs out!
Lithium batteries of different capacities cannot be used in series: Lithium batteries of different capacities are connected in series. Small capacity lithium batteries will be discharged first, while large capacity lithium batteries will be discharged first. will always beloaded. In the discharged state, the consequence is that small capacity lithium batteries will undergo "reverse polarity" (reverse charging) and be discarded.
In addition, under high current, the working temperature of small capacity lithium batteries is higher than that of large capacity lithium batteries. During continuous operation at high current, small capacity lithium batteries generate significant heat and. have a lower safety factor.