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🛠️ Power your projects with precision and protection — don’t get left behind!
This 2-pack Enhanced 4S 40A Li-ion Battery Protection Board offers a compact, high-performance solution for managing 4-series lithium battery packs up to 16.8V. Featuring a continuous 40A discharge current and multiple safety protections, it ensures stable, efficient charging and discharging for power tools, electric drills, and motorcycles. Designed for durability and precision, it supports various lithium cell types and optimizes battery lifespan while preventing damage from overcurrent, overcharge, and over-discharge.
| ASIN | B08NJTS9DV |
| Amperage | 40 Amps |
| Best Sellers Rank | #311,441 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #1,328 in Power Converters |
| Brand | ATNSINC |
| Color | 4S 40A |
| Current Rating | 40 Amps |
| Customer Reviews | 4.1 out of 5 stars 84 Reviews |
| Input Voltage | 240 Volts |
| Item Weight | 0.02 Kilograms |
| Manufacturer | Atnsinc |
| Mfr Part Number | 19075 |
| Model Number | 19075 |
| Number of Ports | 2 |
| Output Voltage | 16.8 Volts (DC) |
| UPC | 701715452138 |
B**R
Works well
Works well, used 4 x 18650 li-ion cells together for a drill. The two boards were connected together on arrival but easily split apart by bending slightly. Installed in my drill and charged up to full power. Tested the drill, it works fine, have not used it for any projects yet though. Will update review if have any problems.
T**L
You guys are great
Exceptional value and service. Thank you
W**E
good less expensive BMS
Needs better instruction on how to connect it up. Made mistakes and blew two boards. Seems to work okay when connected properly.
I**N
Does not preventing from over discharge!
Not working as advertised. I purchased the board to protect my 4s battery pack from overdischarge, but it did not cut the power and let it drain down to 12.5v. I am glad i caught it in time, and shut it down. However, a discharge below 2.8v may damage the cells. The device seems not to be working.
K**Y
Good enough for the price, can’t handle high current
I bought this to prototype a pack, and while it seems to balance my cells, and is easy to use, there no way it can handle 40A as stated. At even short bursts of about 25A some of the components on the board are toast. It’s not exactly a knock against the board, it works fine at lower currents. Just know that you’re probably safe in the 5 amp range.
B**B
Not to good
They don't work to good they ok for low amps try to pull more they 5 amps they shut down
S**R
Shorted Order Confusion
I ordered the 2Pack, but only received 1. The Amazon App does not provide a way to resolve this. UPDATE: The board I received is actually 2 circuits on the same board - not what the product picture shows.
W**S
Don't know what you're getting into
Did not stop my battery from overcharging I glad I'm checked... One battery was at 4.48v and two others was at 4.3v!!!! I bought these in the past and used it for a battery and haven't had any problems but lately using it on the same battery type and style there's new issues..... It seems to pull more power on two of the battery post even when I switch the batteries around which is annoying It disconnects it at 2.5 volts which is really not healthy for your battery pack
م**د
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