4S 40A Li-ion Lithium Battery 18650 Charger PCB BMS Protection Board with Balance For Drill Motor 14.8V 16.8V Lipo Cell Module
156
Direct purchase from the factory 
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Feature:
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, polymer lithium battery)
Product Size: 45 * 55 * 3.4mm (Standard Edition / Enhanced), 46 * 60 * 3.4mm (balanced version)
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.
| Project | Min. | Typ. | Max. | Units |
| Consuming current | 12 | 18 | 24 | uA |
| Overcharged protection voltage | 4.2 | 4.25 | 4.3 | V |
| Balanced starting voltage | 4.17 | 4.2 | 4.23 | V |
| Equilibrium current | 95 | 100 | 105 | mA |
| Balanced heating power | 1.56 | 1.72 | 1.91 | W |
| Overcharge recovery voltage | 4.1 | 4.15 | 4.2 | V |
| Over-discharge protection voltage | 2.4 | 2.5 | 2.6 | V |
| Overvoltage protection after over-discharge protection | 2.8 | 3 | 3.2 | V |
| Overvoltage protection after over-discharge protection | 3.2 | 3.5 | 3.8 | V |
| Over-discharge recovery voltage | 2.9 | 3.2 | 3.3 | V |
| Conduction internal resistance | 2.5 | 3 | 3.5 | mu03a9 |
| Overcurrent protection current C | 70 | 80 | 90 | A |
| Overcurrent delay time | 100 | 150 | 200 | ms |
| Continuous operating current | 0 | 40 | 40 | A |
| Continuous output power | 0 | 672 | 672 | W |
| Ambient temperature | -40 | 25 | 85 | u00b0C |
| Troubleshooting: | ||
| Fault phenomenon | Fault check and cause | The solution |
| Unable to charge | Measuring the voltage of 4 groups of batteries. when one of the battery voltages exceeds 4.25V, the protection board will activate overcharge protection. | Pair the battery pack well, do not mix the good battery and the bad battery. |
| Unable to discharge | Measuring the voltage of 4 groups of batteries. when one of the battery voltages is lower than 2.7V, the protection board will activate the over-discharge protection. | Pair the battery pack well, do not mix the good battery and the bad battery. |
| Charging/discharging failure | 0V, 4.2V, 8.4V, 12.6V, 16.8V miswired | Rewire or replace the new board (human failure, no warranty) |
| Overcharge/over-discharge failure | 0V, 4.2V, 8.4V, 12.6V, 16.8V miswired | Rewire or replace the new board (human failure, no warranty) |
| Discharge protection | Check that the battery pack has sufficient discharge capability and check that the load"s starting current exceeds the over-current protection current of the protection board. | Replace the battery pack with a higher discharge capacity, or a protective plate with a larger current (super working range) |
| Component soldering | There is no connection between one of the components and the PCB pad. | Repair welding |
| Component welding | There is a short circuit between two or more pins of the component. | Remove the component and re-weld |
| Electrostatic breakdown A | In the unpowered state, measure the G, D, and S poles of the MOSFET. If the forward and reverse resistances of any two pins are 0u03a9, it indicates that it has broken down. | Remove the replacement MOS tube |
| Electrostatic breakdown B | Remove the MOS tube and measure the resistance of the G and D, G and S poles of the MOS tube. If there is a resistance indicating that it has broken down, the resistance should be infinite. | Remove the replacement MOS tube |
Package includes:
1 x Battery Protection Board
1 x Battery Protection Board
