
2S 20A 8.4V 18650 Lithium Battery Protection Board
The 2S 20A 8.4V Lithium Battery Protection Board is a compact BMS that safeguards packs built from two 18650 or similar lithium-ion cells wired in series. When buyers look up the 2S 20A BMS price in Bangladesh, this board stands out because it combines separate balanced charging ports with a generous 20A discharge limit. It watches each cell and disconnects the pack on overcharge, overdischarge, overcurrent or a short circuit, protecting both your batteries and your project. That makes it ideal for 7.4V robot builds, DC motor projects, portable speakers, mini UPS units and DIY power supplies. Order from Tekko and buy this 2S lithium battery protection board in Bangladesh to keep your 7.4V packs safe and long lasting.
Key Features:
• Designed for 2S Li-ion packs — 7.4V nominal, 8.4V on full charge
• Supports up to 20A discharge current for demanding loads
• Overcharge protection stops charging above the safe per-cell voltage
• Overdischarge protection cuts the load before cells are damaged
• Overcurrent and short-circuit protection guard against wiring faults
• Separate balanced charging ports help keep both cells at equal voltage
• Compact board slips easily into robot, speaker and power-pack enclosures
Not sure it will work? Test your circuit free in Tekko Sim — on your phone, in Bangla or English.
| Category | Modules |
| Model no. | BMS-2S-20A |
| Availability | In stock |
| In stock | 2 pcs |
| Delivery | Cash on Delivery, nationwide Bangladesh |
| Model | 2S 20A lithium battery protection board (BMS) |
| Battery Configuration | 2S Li-ion (2 x 18650 series), 7.4V nominal / 8.4V max |
| Discharge Current Limit | 20A |
| Overcharge Protection | approx 4.25V - 4.35V per cell |
| Overdischarge Protection | approx 2.3V - 3.0V per cell |
| Protection Functions | overcharge, overdischarge, overcurrent, short circuit |
| Balanced Charge Ports | separate charging taps for cell balancing |
| Wiring Points | B- (pack negative), BM/B1 (cell midpoint), B+ (pack positive) |
| Suitable For | 7.4V robot packs, motor projects, portable speakers, DIY mini UPS |
| Charger Requirement | 2S lithium charger with 8.4V output only |
| Precaution | connect cells in the correct order and never reverse polarity |
| Weight | approx 5 g |

