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Safely charge and discharge custom 2-cell lithium battery packs with this compact 2S 3A BMS module. Features overcharge, over-discharge, and short-circuit protection for 18650 cells. A must-have for safe DIY power systems.
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IMAX-B6AC Battery Charger for Lithium Ion Polymer Lead Acid NiMH ₹3,499.00 Crucial Battery Protection Lithium-ion batteries (like the popular 18650 cells) are incredibly energy-dense, but they are highly sensitive to abuse. If you drain an 18650 cell below 2.5V, it can permanently degrade. If you overcharge it past 4.25V, it can catch fire. This 2S 3A BMS acts as a smart digital bouncer for your battery pack. The onboard IC constantly monitors the voltage of both cells. If the voltage drops too low or spikes too high, the dual 8205A MOSFETs on the back of the board instantly cut the connection to the outside world, keeping your cells perfectly safe.
Ultra-Compact Form Factor Space is usually at a premium in custom electronic builds. This protection board measures an incredibly small 36mm long by 6.5mm wide. This slim profile allows it to be tucked neatly between the grooves of two side-by-side 18650 cells before you wrap them in PVC heat shrink, resulting in a professional-looking, OEM-quality custom battery pack.
Simple 5-Pad Wiring Layout. Wiring a BMS might seem daunting, but this board makes it highly straightforward. It features exactly five solder pads:
B+: Connects to the main Positive terminal of your battery pack.
B-: Connects to the main Negative terminal of your battery pack.
BM (Battery Mid-point): Connects to the bridge wire connecting Cell 1 to Cell 2.
P+: The Positive output to your load (and input from your 8.4V charger).
P-: The Negative output to your load (and input from your charger).
Configuration: 2S (2 Cells in Series)
Nominal Voltage: 7.4V
Fully Charged Voltage: 8.4V
Maximum Continuous Discharge Current: 3A
Overcharge Detection Voltage: 4.25V ± 0.05V (per cell)
Over-discharge Detection Voltage: 2.90V ± 0.05V (per cell)
Short Circuit Protection: Yes (Auto-recovery after removing load/connecting charger)
MOSFET Type: Dual 8205A
Dimensions: 36mm x 6.5mm
DIY Bluetooth Speakers: Safely powering 10W or 15W amplifier boards using a high-capacity 7.4V pack that won't die prematurely.
Custom RC Transmitters: Upgrading cheap AA-powered remote controls to use rechargeable 18650 lithium packs.
Arduino Robotics: Providing stable, safe power for 6V-9V DC motors on small desktop rovers without risking short circuits if the motors stall.
Unlock New Capabilities (Project Evolution)
The Custom Smart Power Bank: Don't just run raw voltage to a motor! Evolve your project by adding a DC-DC Buck Converter to the output. Build a massive 2S2P (4-cell) battery pack, wire it safely through this BMS, and then route the P+ and P- pads into a 5V USB Buck Module. You have just built a custom, ultra-high-capacity USB power bank to charge your smartphone during long camping trips!
1 x 2S 3A 18650 Lithium Battery Protection Board (FDC-2S-2)
Note: 18650 batteries, wiring, nickel strips, and battery holders are NOT included. This module requires basic soldering skills for assembly.
What does "2S" mean? "2S" stands for "2 Series". It means this board is designed for a battery pack that has exactly two lithium cells wired end-to-end (in series), bringing the total nominal voltage to 7.4V (3.7V + 3.7V).
What does "3A" mean? 3 Amps is the maximum continuous current this board will allow your device to draw before the over-current protection kicks in and shuts the power off.
Can I use this with 3S (11.1V) or 4S (14.8V) packs? No. This BMS is strictly programmed for the voltage limits of a 2S pack. Using it on larger or smaller packs will result in failure or fire.
What is the "BM" pad for? BM stands for Battery Mid-point. Because this board monitors both cells individually to ensure neither one overcharges, it needs a connection to the metal bridge that links the positive of Cell 1 to the negative of Cell 2.
Does this module actively balance the cells? No. Standard 3A BMS modules like this only protect the cells (cutting power if one drops too low or goes too high). They do not have the bleeding resistors required to actively balance them. Always use cells that are at the exact same voltage when building your pack.
Where do I connect my motors or lights? You connect your load to the P+ and P- pads. Never connect your load directly to the B+ and B- pads, as this bypasses the protection completely!
Where do I plug in the charger? You also connect your charger to the P+ and P- pads. The charge and discharge ports are shared on this board.
What kind of charger do I need? You must use a dedicated lithium-ion charger designed for 2S packs, which outputs exactly 8.4V.
Can I charge this with a standard 5V USB phone charger? No. 5V is not enough voltage to push power into a 7.4V/8.4V battery pack.
Can I use this with LiFePO4 batteries? No. LiFePO4 batteries have different chemistry and lower voltage limits (3.2V nominal). This board's 4.25V cut-off will severely overcharge and ruin LiFePO4 cells.
What is the exact size of the board? It is extremely small, measuring 36mm long by 6.5mm wide.
Why isn't there power at the P+ and P- pads after I soldered everything together? This is a common safety feature. Most BMS boards go into a "sleep" or "lock" mode after being disconnected from power (or during initial soldering). To wake it up, apply your 8.4V charger to the P+ and P- pads for a single second.
What are the black chips on the back? The two identical chips are 8205A MOSFETs. They act as the electronic gates that quickly open and close to allow or stop the flow of electricity during a fault.
Can I run a fast RC car or drone with this? Likely not. High-speed RC motors draw massive bursts of current (often 10A to 30A), which will instantly trigger the 3A over-current protection on this board and stall your vehicle.
What happens if the positive and negative output wires touch? The short-circuit protection will detect the massive spike in current and instantly cut the output power, preventing the batteries from melting or venting.
How does the board reset after a short circuit? Once you remove the short circuit or the heavy load, the board should auto-recover. If it does not, plug it into your 8.4V charger for a moment to reset the protection IC.
At what voltage will it cut off power to save my battery? It will sever the connection when it detects that either cell has dropped to approximately 2.9V.
Can I solder wires directly to my 18650 cells? While possible, it is highly discouraged. The heat from a soldering iron can quickly damage the internal chemistry of the battery. It is always safer to use a spot welder with nickel strips, or use spring-loaded plastic battery holders.
Do I need one of these boards per battery? No. This single 2S BMS board handles the entire 2-cell battery pack.
Can I put multiple 18650s in parallel to make a larger pack (like 2S2P)? Yes! If you wire two cells in parallel, the BMS treats them as one single, large-capacity cell. A 2S2P pack (4 batteries total) will work perfectly with this BMS, provided your total load still doesn't exceed 3 Amps.
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This item is covered by a warranty of 7 days from the date of delivery, against confirmed manufacturing defects only, as verified by Probots' own testing and investigation. In case of a confirmed defect, we will replace the item — a refund is issued only if a replacement can't be supplied (e.g. discontinued or out of stock). Transit damage or a wrong item received must be reported within 3 days of delivery.
If the product shows signs of misuse, tampering, physical damage, static discharge, liquid or fire damage, use of unapproved chemicals, or has been soldered or physically altered in any way.
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Probots sells every Electronics Part for your next Project. You can order 10,000+ Electronic Parts Online - Arduino, Raspberry Pi, NodeMCU Development Boards, Sensors, Motors, Motor Drivers, SMPS, Plastic Enclosures etc in India directly on probots.co.in
We offer specialized services for Bulk, Wholesale & B2B Customers like discounted prices, additional shipping options, customised products, etc . Customer with large quantity & regular orders qualify for the specialised discounted rates.
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Available all children school project spears parts like electronics
It was good experience
Staff is very patient and helpful
One of the best place for electronics you will get everything you want! With the best and orginal quality
Very helpful staff and the best place to buy components for projects
Wonderful store with expert service and technically strong people.
Prompt delivery, excellent technical support
Large inventory of electronic components and parts. Well trained service personnel and technicians who can quickly identify and rectify product defect if any. They are a reliable and trustworthy online stores.
Excellent and prompt service
Excellent and prompt response, great and Quality product... All the best... Thank you
I got the thing that was taking the whole Bangalore to search for here
Excellent attitude and prompt service by Bharath. Saved me a trip to SP Road while having ample time to explore new products. Ended up buying much more than what i had originally envisaged. Hope to engage more often and upgrade my skills. God bless
We are into electronics & mechanical projects in this connection we had contacted probots & we visited them , To our pleasant surprise , their presentation with us was friendly wrapped with professional support , which helped us to choose better , this interaction was patient & excellent .with all confidence i shall promote them to my known sources looking for components . Pls maintain this attitude towards customer this shall take your organization to heights
Great place to get all electronic components and accessories for electronic products.
Fast Delivery, Accurate information, Quick resolution, most important acceptance & accountability and willingness to help.
Available all children school project spears parts like electronics
It was good experience
Staff is very patient and helpful
One of the best place for electronics you will get everything you want! With the best and orginal quality
Very helpful staff and the best place to buy components for projects
Wonderful store with expert service and technically strong people.
Prompt delivery, excellent technical support
Large inventory of electronic components and parts. Well trained service personnel and technicians who can quickly identify and rectify product defect if any. They are a reliable and trustworthy online stores.
Excellent and prompt service
Excellent and prompt response, great and Quality product... All the best... Thank you
I got the thing that was taking the whole Bangalore to search for here
Excellent attitude and prompt service by Bharath. Saved me a trip to SP Road while having ample time to explore new products. Ended up buying much more than what i had originally envisaged. Hope to engage more often and upgrade my skills. God bless
We are into electronics & mechanical projects in this connection we had contacted probots & we visited them , To our pleasant surprise , their presentation with us was friendly wrapped with professional support , which helped us to choose better , this interaction was patient & excellent .with all confidence i shall promote them to my known sources looking for components . Pls maintain this attitude towards customer this shall take your organization to heights
Great place to get all electronic components and accessories for electronic products.
Fast Delivery, Accurate information, Quick resolution, most important acceptance & accountability and willingness to help.
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