Bombay Electronics
Bombay Electronics
Grant Road, Mumbai, Maharashtra
GST No. 27AABPC5348L1ZO
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Battery Management Systems

Our product range includes a wide range of 4 series 40a 18650 lithium battery protection board 14.8v 16.8v with balance for drill motor, 4 series 30a 18650 lithium battery protection board 14.8v 16v with cable, 3 series 20a 18650 lithium battery protection board 11.1v 12v 12.6v, 3 series 11.1v 12v 12.6v lithium battery protection plate 10a current, 3 series 12v18650 lithium battery protection plate 11.1v 12.6v with balanced 25a and 18650 3.7v lithium battery protection plate 6mos, spot welding can be many.

4 Series 40A 18650 Lithium Battery Protection Board 14.8V 16.8V With Balance For Drill Motor

4 Series 40A 18650 Lithium Battery Protection Board 14.8V 16.8V With Balance For Drill Motor
  • 4 Series 40A 18650 Lithium Battery Protection Board 14.8V 16.8V With Balance For Drill Motor
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Approx. Price: Rs 230 / PieceGet Latest Price

Product Details:

Model Name/Number4 Series 40A 18650 Lithium Battery Protection Board
Weight9.3g
Charging Current: 16.8V - 18.1V.
Nominal voltage3.6V, 3.7V lithium battery
Strictly according to map wiring0V, 4.2V, 8.4V, 12.6V, 16.8V
balanced current40A, 100mA

Features:4 string 16.8V 40A lithium battery protection board (comes with recovery function-AUTO Recovery).Scope: Nominal voltage of 3.6V, 3.7V lithium battery (including 18650,26650, a polymer lithium battery).Product weight: 9.3g (standard / enhanced version), 10.3g (balanced version).Charging voltage: 16.8V – 18.1V.Continuous discharge current (upper limit): 40A (if the cooling environment is not good, please reduce the load current use).Continuous charge current (upper limit): 20A.Equalization version: suitable for starting current below 80A, power 135W below the drill.
Package Includes:1 x 4 Series 40A 18650 Lithium Battery Protection Board.
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4 Series 30A 18650 Lithium Battery Protection Board 14.8V 16V with Cable

4 Series 30A 18650 Lithium Battery Protection Board 14.8V 16V with Cable
  • 4 Series 30A 18650 Lithium Battery Protection Board 14.8V 16V with Cable
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Approx. Price: Rs 280 / PieceGet Latest Price

Product Details:

Capacity10uF-100uF
Nominal voltage of3.6V, 3.7V lithium battery
power battery,15C-20C
Strictly according to map wiring0V, 4.2V, 8.4V, 12.6V, 16.8V
withstand voltage above25V
size of approx46 x 60 x 3.4 mm

4 Series 30A 18650 Lithium Battery Protection Board 14.8V 16V with Cable, a Balance Board for Drill Motor Lipo Cell Module comes with recovery function-AUTO Recovery and Integrated 10 low load resistance MOS tube.It provides continuous discharge of 30A, Balanced current, for electric drill/sprayer/LED lights/low power inverter.  (if the cooling environment is not good, please reduce the load current use)The Scope of Nominal voltage of 3.6V, 3.7V lithium battery (including 18650,26650, a polymer lithium battery) where Charging voltage can be range between 16.8V to 18.1V The board operates smoothly with Continuous charge current of (upper limit): 20A. The balanced version is suitable for starting current below 80A, power 135W below the drill (with balance)The Board comes in a size of approx. 46 x 60 x 3.4 mm which can be easily installed in a compact size or on battery bundle itself.
Note:The Successful start of the drill requires three 15C-20C power battery, or six 10C-15C power battery (ordinary 18650 cannot start the drill!!)Strictly according to map wiring 0V, 4.2V, 8.4V, 12.6V, 16.8V, do not deliberately short circuit.When the load of the brush motor is used, try to connect a non-polar capacitor (withstand voltage above25V, capacity 10uF-100uF) to the motor’s positive and negative terminals to prevent the reverse spike from the motor. Break the MOS tube.4 groups of batteries in series, please ensure that the voltage of each group of batteries, if not the same,  please fill each battery separately and then use in series. The Discharge test, the voltage drop faster battery that group is a poor battery.
Features:Overcharge protection,Over-discharge protection function, short circuit protection function,Overcurrent protection function, band balance.
Package included:1 x 4 Series 30A 18650 Lithium Battery Protection Board1 x Battery Connecting Cable
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3 Series 20A 18650 Lithium Battery Protection Board 11.1V 12V 12.6V

3 Series 20A 18650 Lithium Battery Protection Board 11.1V 12V 12.6V
  • 3 Series 20A 18650 Lithium Battery Protection Board 11.1V 12V 12.6V
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Approx. Price: Rs 90 / PieceGet Latest Price

Product Details:

Rated voltage of polymer battery10.8V
18650 or 3.7V lithium battery rated voltage11.1V
Lithium battery full charge voltage12.6V
maximum working current2AH * 1 = 2A
maximum working current2AH * 3 = 6A
charge voltage12.6V
maximum operating current2AH*1=2A.3C ratio of the battery

3S 11.1V 10A 18650 Lithium Battery Overcharge And Over-current Protection board (BMS) ensures the security of battery pack. This battery management system design and Suitable for: 10.8V (Rated voltage of polymer battery) 11.1V (18650 or 3.7V lithium battery rated voltage) 12.6V (Lithium battery full charge voltage)Note: Please allow 1-3mm errors due to manual measurement. Item color displayed in photos may be showing slightly different on your computer monitor since monitors are not calibrated sameAlso, Note down and take care of following things while using 3S 11.1V 18650 Lithium battery protection board 12V 10A Overcharge And Overcurrent protection.1. Higher than 3A current discharge product, the discharge rate of battery discharge is above 3C.2. Multiplier calculation formula: 1C battery, 2000 capacity is equal to 2AH * 1 = 2A maximum working current.3. 3C ratio battery, 2000 capacity is equal to 2AH * 3 = 6A maximum working current.4. When the battery in series 3, please ensure that the voltage of each battery is the same, if not the same, please fill in each set of batteries and then use… When the discharge is tested, the battery in which the voltage drop is the fastest is the difference between the battery and the battery.5. After the line is connected to the need to charge (charge voltage 12.6V) activation, there will be output.6. 3A current above the discharge products, the battery discharge rate to 3C or more.Formula: 1C ratio of the battery, the 2000 capacity is equal to the maximum operating current 2AH*1=2A.3C ratio of the battery, the 2000 capacity is equal to the maximum working current 2AH*3=6A.in the use of the battery will be the battery power is not applicable, this situation must not be used for a long time, the battery will soon be damaged. Description interpretation.7. 3 Series (series combination of 18650 3 batteries or lithium polymer batteries)8. 10.8V (polymer battery rated voltage)9. 11.1V (18650 or 3.7V lithium battery rated voltage)10. 12.6V (lithium battery voltage)In the process of use, if the battery heat, the battery power is not applicable. This situation cannot be used for a long11. time. Otherwise, the battery will soon be damaged.
Features :1. Three series of lithium battery protection board.2. Automatically cancel protection after protection conditions restore.3. With the function of overcharge protection, over discharge protection, short circuit protection, over-current protection.4. Suitable for lithium battery pack of 11.1V, 12V, 12.6V.5. Quiescent current < 30uA, so power consumption is small.
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3 Series 11.1V 12V 12.6V Lithium Battery Protection Plate 10A Current

3 Series 11.1V  12V  12.6V Lithium Battery Protection Plate 10A Current
  • 3 Series 11.1V  12V  12.6V Lithium Battery Protection Plate 10A Current
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Approx. Price: Rs 75 / PieceGet Latest Price

Product Details:

Operating current6 8A.
Current limit10 13A.
Storage condition40 80
Resting currentless than 30uA
Effective lifetimeover 30000 hours
Internal resistanceless than 100m

In 3S 10A 12V 18650 Lithium Battery Charger Board Protection Module, 3S stands for 3 18650 batteries or polymer lithium battery series combination. With 10.8V rated voltage for polymer battery, 11.1V 18650 or 3.7V lithium battery rated voltage and  12.6V lithium battery can be charged. And discharge 10A (referring to the maximum discharge current limit) Lithium battery protection board it also Comes with over-charge, over-discharge, over-current, short circuit protection.formula expansion :1C battery expansion, 2000 capacity is equal to 2AH * 1 = 2A upper limit of current.3C battery expansion, 2000 capacity equal to 2AH * 3 = 6A upper operating current.If the battery gets heat, does not apply that battery, such a situation cannot be long-term use, the battery will soon be damaged.Notes :1: strictly according to the drawing wiring 0 V (B), 3.7 V (B1), 7.4 V (B2), 11.1 V (B +), not intentionally short circuit!2: Once you have charged the first line, it will have output.3: When connecting three battery groups, please make sure that the voltage of each battery group, if not the same, fill each battery separately and then use it in series. discharge test, the fastest battery voltage drop, which group is low battery. (2 good battery + a use effect = 3 low battery low battery use effect).Warning:The protection board can not be used for lithium iron phosphate batteries, lamp hernia, hand drill battery, electric battery fish, electric bicycle battery, car battery for children, 775 (4A) motor, 1 W fish eye LED light, please pay attention customer purchase connection! Described in terms of power for the following products: Massager rechargeable battery, LED ready light power supply, 12 V electronic products, solar street lamp battery, power backup monitor, and other products.Features :1. Operating current : 6 – 8A.2. Current limit : 10 – 13A.3. Storage condition : -40 ~ +80 ???.4. Resting current: less than 30uA.5. Effective lifetime: over 30,000 hours.6. Internal resistance: less than 100mΩ.7. Short-circuit protection: protection.8. Self-recovery delay.
Package Includes :1 x 3S 10A 12V 18650 Lithium Battery Charger Board Protection Module.
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3 Series 12v18650 Lithium Battery Protection Plate 11.1v 12.6v With Balanced 25a

3 Series 12v18650 Lithium Battery Protection Plate 11.1v 12.6v With Balanced 25a
  • 3 Series 12v18650 Lithium Battery Protection Plate 11.1v 12.6v With Balanced 25a
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Approx. Price: Rs 165 / PieceGet Latest Price

Product Details:

Operating current6 - 8A.
Current limit10 - 13A.
Storage condition40 80
Resting currentless than 30uA
Internal resistanceless than 100mm
strictly according to the drawing wiring0 V (B), 3.7 V (B1), 7.4 V (B2), 11.1 V (B +), not intentionally short circuit

This is 3S 12V 25A 18650 Lithium Battery Protection Board 11.1V 12.6V High Current With Balanced Circuit Over Charge Over-Discharge Over Current And Short Circuit Protection Function. Board charging and discharging are the same port, the board includes the balanced circuit.When the charge balance, the board will be a bit warm, even after disconnecting the charger, some are still in the balance, will continue to warm for a while until below the equilibrium break threshold.The protection board cannot be used for iron lithium polymer battery (for other batteries, no matter what material, as long as the overvoltage and put voltage can be used for cutting), electric finish machinery, electric bicycle batteries, car, and motorcycle starter battery protection.Applicable to the following products (within rated power):Electric drill, 775 motors (6A-10A), small power inverter, small power vacuum messenger battery, LED lamp, 12V standby power electronic products, 12V120W car washing pump, battery, solar street lamp monitoring standby power supply, and other products.Rated current can’t over 25A, it can’t exceed 50A per 0.5 seconds.Specifications :1. Overcharge voltage range: 4.25-4.35v + 0.05v.2. Over Discharge voltage range: 2.3-2.7v + 0.05v.3. Operating current: 0 – 25A.4. Operating temperature: -40 – +50???.5. Instantaneous current: 35 – 40A.6. Storage condition: -40 – +80???.7. Quiescent current: less than 30uA.8. Balance current: about 40 – 50mA.9. Effective life: more than 30000 hours.10. Internal resistance: less than 100m ohm.11. Short-circuit protection: protection, delayed self recovery.
Package includes:1 x 12.6V BMS 3S 25A 18650 Lithium Battery Protection Board
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18650 3.7v Lithium Battery Protection Plate 6mos, Spot Welding Can Be Many

18650 3.7v Lithium Battery Protection Plate 6mos, Spot Welding Can Be Many
  • 18650 3.7v Lithium Battery Protection Plate 6mos, Spot Welding Can Be Many
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Approx. Price: Rs 55 / PieceGet Latest Price

Product Details:

Overcharge detection voltage4.25 + 0.05V.
Over charge release voltage4.23 + 0.05V
discharge detection voltage2.45 + 0.1V.
Ceiling continuous current12A.
Overcurrent detection current15A.
Input Charging voltage4.2V
IC componentsDW01+8205A.

Nowadays Li-ion batteries are most popular to be used in many indoor and outdoor gadgets, these batteries are preferred due to their high charge storage capacity. such batteries are widely used in today’s portable devices. they are compact, more efficient and have a high energy intensity compared to other types of batteries.One drawback of such a battery is that we need to continually monitor their charging and discharging process if we do not do this, it badly affects battery life and also reduces the charge storing capacity. If we discharge such battery below certain voltage range, then the battery cell has a high risk of damage and if we overcharge such battery then it may explode.To overcome such issues, we can use battery protection and battery charging circuits such as this product. This is Li-ion single-cell charger/protection circuit which can be used to charge a single cell of 15 Amp capacity or 2500Mah parallel-connected 5 to 6 li-ion cells. In this MOSFET are employed to do the monitoring task which protects our battery cells from overcharge, over-discharge, and from short circuit.Protection :1. Overcharge protection.2. over-discharge protection.3. short circuit protection.4. overcurrent protection.Wiring instructions:1. B+ battery is positive.2. B- battery negative.3. P+ outputs the positive input for the battery pack.4. P- outputs the negative electrode for the battery pack.
Specifications and Features :1. Overcharge detection voltage : 4.25 + 0.05V.2. Over charge release voltage : 4.23 + 0.05V.3. discharge detection voltage : 2.45 + 0.1V.4. Ceiling continuous current : 12A.5. Overcurrent detection current : 15A.6. Input Charging voltage : 4.2V.7. IC components : DW01+8205A.
Package Includes :1 x 1S 18650 3.7V lithium battery protection plate 6 MOS.
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2 Sets of 7.4V 8.4V Lithium Battery Pack, Protection Board, 3A Current, Can Avoid Over Charging

2 Sets of 7.4V 8.4V Lithium Battery Pack, Protection Board, 3A Current, Can Avoid Over Charging
  • 2 Sets of 7.4V 8.4V Lithium Battery Pack, Protection Board, 3A Current, Can Avoid Over Charging
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Approx. Price: Rs 40 / PieceGet Latest Price

Product Details:

Over-Discharge Detection Voltage2.3-3.0V 0.05V.
Maximum Working Current3A
Transient Current5A
Operating Temperature40-50 C.
Internal ResistanceLess than 45m
B+ B-The interface of battery core.

2S 3A Li-ion Lithium Battery 7.4V 8.4V 18650 Charger Protection Board Module is a small PCB mounted Li-ion Lithium Battery charger protection module. This small and smart battery charger protection module comes with various features like Short circuit protection, Overcharge protection, Over-discharge protection, Overcurrent protection. It is very easy to install and convenient to use in all your DIY portable projects.Pin Descriptions: B+ B-: The interface of battery coreP+ P-: The connector of the battery boardMB: The connection point between the batteriesB+: Battery V+ PositiveB-: Battery V- NegativeP+: Output / Charging V+P-: Output / Charging V-Note:The protection board cannot be used for lithium iron phosphate batteries, hernia lamps, hand drill battery pack, electric fish battery pack, electric bicycle battery pack, buggy battery, 775 (4A) above the motor, 1W fisheye LED lamp.
Features :1. Over-Discharge Detection Voltage: 2.3-3.0V±0.05V.2. Maximum Working Current: 3A.3. Transient Current: 5A.4. Operating Temperature : -40-50 C.5. Internal Resistance: Less than 45m Ω.6. B+ B-: The interface of battery core.7. P+ P-: The connector of the battery board.8. MB: The connection point between the batteries.
 Package Includes :1 x 2S 3A Li-ion Lithium Battery 7.4V 8.4V 18650 Charger Protection Board Module.
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4 Series 14.8V18650 Lithium Battery Equalization Plate ,4S16.8V, Polymer Battery Equalization Plate

4 Series 14.8V18650 Lithium Battery Equalization Plate ,4S16.8V, Polymer Battery Equalization Plate
  • 4 Series 14.8V18650 Lithium Battery Equalization Plate ,4S16.8V, Polymer Battery Equalization Plate
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Approx. Price: Rs 70 / PieceGet Latest Price

Product Details:

Supply Voltage14.8V/16.8V.
Dissipation Power18650 Lithium Battery Balanced Function Board
Operating TemperatureDischarge Shunt balanced 4.2V 66mA
18650 Lithium Battery Balanced Function Board.14.8V/16.8V
B1 connects the battery 1with the contact in battery 2.
B2 connects the battery 2with the contacts in the battery 3.
B3 Connect the battery 3to the contact in the battery 4.

The 4 Series 14.8V 18650 Lithium Battery Equalization Board is suitable for the lithium battery pack with no equalization charge and the charging balance is balanced Make each battery in the battery pack full of electricity at the same time.The balance sheet has no charge and discharge protection function and can not replace the protective plate; when the battery is charged, the battery filled with electricity is discharged through the resistance so that the battery can be charged Split equalization.Pin Description:1. B connected battery anode.2. B1 connects the battery 1 with the contact in battery 2.3. B2 connects the battery 2 with the contacts in the battery 3.4. B3 Connect the battery 3 to the contact in the battery 4.5. B4 Battery positive.Features :1. Type: Voltage Regulator.2. Supply Voltage:14.8V/16.8V.3. Dissipation Power:18650 Lithium Battery Balanced Function Board.4. Operating Temperature: Discharge Shunt balanced 4.2V 66mA.5. Application:14.8V/16.8V 18650 Lithium Battery Balanced Function Board.
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4 Series High Current Li-ion Battery Charger Protection Board 14.4V 14.8V 16.8V DIY Module

4 Series High Current Li-ion Battery Charger Protection Board 14.4V 14.8V 16.8V DIY Module
  • 4 Series High Current Li-ion Battery Charger Protection Board 14.4V 14.8V 16.8V DIY Module
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Approx. Price: Rs 150 / PieceGet Latest Price

Product Details:

Model Name/NumberProtection Board Battery Charging Module
nominal voltage14.4V
lithium battery pack14.8V
lithium battery pack16.8V
Overcharge release voltage4.15 +- 0.05V.
Over-discharge termination voltage3 +- 0.1V.
Working current15A
natural cooling10A
plus the heat sink15A
maximum instantaneous current30A
Working temperature40~+85 degrees

The 4 Series 14.8V 18650 Lithium Battery Equalization Board is suitable for the lithium battery pack with no equalization charge and the charging balance is balanced Make each battery in the battery pack full of electricity at the same time.This new 4 string lithium battery protection board is suitable for the nominal voltage 14.4V lithium battery pack, 14.8V lithium battery pack, 16.8V lithium battery pack. With automatic activation, protection conditions automatically restored after the restoration of protection, no charger activation, the use of more convenient.The protection board can be modified according to your requirements voltage, current, and other parameters.
Features:1.  The module name: 4 string lithium battery protection board.2.  The modular nature: polymer lithium battery protection board.3. Overcharge release voltage: 4.15 ± 0.05V.4. Over-discharge termination voltage: 3 ± 0.1V.5. Working current: 15A (natural cooling:10A, plus the heat sink:15A, the maximum instantaneous current:30A)6. Termination conditions: the release of protection condition then automatic recovery, without activation (optional charger to activate).7. Main functions: the overcharge protection function, over-discharge protection, short-circuit protection, over current protection.8. Working temperature: -40~+85 degrees (high-temperature environment and please strengthen radiating).9. Connection: welding output.
Package Includes:1 x 4S High Current up to 30A Lithium Battery Protection Board
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2 Series 8.4V Lithium Battery Protection Plate

2 Series 8.4V Lithium Battery Protection Plate
  • 2 Series 8.4V Lithium Battery Protection Plate
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Approx. Price: Rs 45 / PieceGet Latest Price

Product Details:

LED light1W fish eye
Connected to the battery positiveB +
Connected battery negativeB -
Connect the battery 1 to the connection point before battery 2MB
Charge / discharge side positive (shared charge / discharge side)P +
Connection / discharge terminal negative (charge / discharge side shared)P -

This is an HX-2S-A2 Circular 2S 8.4V BMS 18650 Lithium Battery Protection Plate With short circuit protection, overload, discharge and overcharge protection.  Due to its small size, excellent performance and low cost, the product is suitable to meet a wide range of requirements.Note:• The battery will heat when using it, it means the battery does not apply, please don’t keep using because the battery will be damaged soon.• The protection board cannot be used for lithium iron phosphate battery, hernia lamp, hand drill battery pack, electric fish machine battery pack, electric bicycle battery pack, children’s car battery, 775 (4A)motor, 1W fish eye LED light!Connector :• B +:   Connected to the battery positive• B-: Connected battery negative• MB: Connect the battery 1 to the connection point before battery 2• P + :  Charge / discharge side positive (shared charge / discharge side)• P- :    Connection / discharge terminal negative (charge / discharge side shared)Features :1. It is safe and reliable to use.2. Small and compact.3. Easy connections.Package Includes :1 x HX-2S-A2 Circular 2S 8.4V BMS 18650 Lithium Battery Protection Plate
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Bombay Electronics
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