Hello,
I'm currently working on a DIY bluetooth speaker. The amplifier that I've chosen needs about 12V for 2x20W speakers that I'm planning to use. The part I don't understand is the 18650 battery management. Most of them have a nominal voltage of 3,7V and maximum voltage of 4,2V. If I understand correctly, using 3S2P configuration would make an 11,1V - 12,6V battery pack, which is good for the amplifier. However, most of the BMS circuits I'm able to find have an over-discharge cutoff at 2,5V. At 3S2P configuration 7,5V would be way too low for the amplfier. Would those BMS's keep the voltage between 11,1V- 12,6V or not? Or is there any way too keep the voltage somewhere around 12V?
For example:
(Title says 11,1V-12,6V, however in the description over-discharge protection for each cell is 2,5V)
3S 40A BMS 11.1V 12.6V 18650 lithium battery protection Board with balanced Version for drill 40A current-in Battery Accessories from Consumer Electronics on Aliexpress.com | Alibaba Group
I'm currently working on a DIY bluetooth speaker. The amplifier that I've chosen needs about 12V for 2x20W speakers that I'm planning to use. The part I don't understand is the 18650 battery management. Most of them have a nominal voltage of 3,7V and maximum voltage of 4,2V. If I understand correctly, using 3S2P configuration would make an 11,1V - 12,6V battery pack, which is good for the amplifier. However, most of the BMS circuits I'm able to find have an over-discharge cutoff at 2,5V. At 3S2P configuration 7,5V would be way too low for the amplfier. Would those BMS's keep the voltage between 11,1V- 12,6V or not? Or is there any way too keep the voltage somewhere around 12V?
For example:
(Title says 11,1V-12,6V, however in the description over-discharge protection for each cell is 2,5V)
3S 40A BMS 11.1V 12.6V 18650 lithium battery protection Board with balanced Version for drill 40A current-in Battery Accessories from Consumer Electronics on Aliexpress.com | Alibaba Group