NEW Daly LiFePo4 4s 12V 100A SMART BMS


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Available in 4S 12V 100AH LiFePO4
Discharge Current: 100A
Charge Current: 100A
Common Port with Balance
6 Safety Protection:

  • Overcharge protection
  • Over discharge protection
  • Over current protection
  • Temperature protection
  • Short circuit protection
  • Drop protection

Please see full details about this product on the specification below.


Available in 4S 12V 100AH
Discharge Current: 100A
Charge Current: 100A
Common Port with Balance

Please note some photos of BMS are different. These are manufacturer’s stock photos for illustration purposes only.  Actual photo is what is shown on the product photos including dimension details.


◆Use top quality (A-level) protective integrated circuit IC, from the solution of Seiko of Japan.

◆Strong load ability, constant discharge current 100A, use high voltage resistance, low inner resistance power Mosfet. The heat sink will greatly help cooling.

◆IC itself has power balancing function. The circuit is simple and reliable.

◆Typical voltage detection for each cell. So each battery will be prevented over charged or over discharged. Over current and short circuit protection function is very reliable. Long time short circuit of the load won’t affect the PCB and the battery temperature protection during charging and discharging.

◆Extreme low power consumption. The consumption of the whole device is less than 50uA.

◆PCB use high anti-corrosion, high water resistance, high impedance ESD conformal Coating.

* Please note the some photos of BMS below are for illustration purposes only.  Actual photo is what you see on the product photo.


 Electrical Parameters:

Below are the actual dimensions for 4S 12V 100AH SMART BMS:

BMS Wiring:

  1. Wiring Operation:

(1) First connect the B-line of the protection board to the total negative pole of the battery pack;

(2) The cable starts from the thin black line connecting B-, the second line connects the positive pole of the first string of batteries, and the next string is connected in turn. The positive pole of the pool; then insert the cable into the protection board;

(3) After the wiring is completed, measure whether the battery B+, B-voltage and P+, P-voltage values are the same, the same, that is, the protection board works positively. otherwise

please follow the above re-operation;

(4) When removing the protection board, first pull out the cable (if there are two cables, pull

the high-voltage cable first, then pull the low-voltage cable), then remove Power line B-.

  1. Items needed Attention (From Manufacturer)
  1. Lithium battery BMS with different voltage platform cannot be used mutually, eg., Life Po4 BMS cannot be used for Li-ion battery.
  2. In utilization, please to make sure to Follow up the designed parameter and utilization conditions.
  3. Charge and discharge current cannot be higher than the quoted current value in specification.
  4. Please to utilize the BMS in the regulated working temperature range, and make sure of the well heat dissipation environment.
  5. No self-taking off and change parts in BMS.
  6. Our product has the function of waterproof, but still suggest avoid of long time water immersion.
  7. We conduct Anode Oxidation process in BMS dissipation plate, but when the Oxidation layer is destroyed, it still may cause electrical conduct. It is still suggested to avoid Dissipation plate contact with Cell and Nickel band.
  8. If the protection board is abnormal, please stop using it, and then solve the problem and use it again;
  9. Do not use two protective plates in series or in parallel.

1.What is the common port and separate port? what is the difference?
We take 13S48V16A BMS as an example, common port 16A means your charge cathode and discharge cathode are connected in the same point end(our P-), charge cathode and discharge cathode are used in the common connection port, so the charge current and discharge current are the same 16A. while the separate port is separately connected by charge cathode (C-) and discharge cathode (P-),  so the charge current and discharge current are different, discharge current 16A, charge current 8A.
2.What is the balance function?
The working principle and function are as followings, when your one cell voltage is up to alarm voltage(Li-ion up to 4.18V, Life Po4 up to (3.6V), then the cell Balance starts to work, balance resistance starts discharge with 35ma(when balance discharge starts to work, BMS will starts a little heat up, which is the normal reflection), the cell is in both charging and discharging status, and others which are not reached to alarm voltage(Li-ion 4.18V, Life Po43.6V)are only in charging status, no discharging, when the fast cell voltage is reached to alarm voltage(Li-ion 4.25V, Life Po43.75V)BMS starts off power protection, all the other cells are all in stop of charging, this process will enable your battery charging in balance current, and your battery voltage are in balance status, but when your cell voltage difference are in a big range, then balance can not be functioning well.
3.The relationship between Battery capacity and BMS current?
There is no direct relationship between  Battery capacity and BMS current, big capacity doesn`t mean a big battery, but rely on continue current, that is to say if your engine is powerful, your should choose high current of BMS, it is not relied on battery capacity.
4. What type of charger should  I choose?
Lithium battery must choose specific charger, do not use Charger for Lead acid battery, for lead acid charger may have MOS with high pressure breakdown protection, which will not protect of BMS over charge. LifePo4 battery charger voltage=battery string No.X3.6V, while Li-ion battery charger voltage=Battery string No.X4.2V.
5. What current BMS should I choose ?
Take 10S36V as an example: what current BMS you choose is relied on your E-bicycle Motor power and current limitation of controller. eg., choose 16A for below 350W, 25A for below500W, 35A for below 800W, 60A for Below 1000W, higher than 1200W please contact Daly service specialist.
6. Whether my BMS damaged?
if you want to check if the BMS is damaged, please take the following steps; test each cell voltage is the same using voltmeter. if the cell voltage different over 1.0V, the fault is displayed that it cannot run, no power supply at the start range, short charge time – all these issues are almost caused by battery cells, if BMS damaged it will display as no charge, no discharge, no discharge while the battery has voltage.


Additional information

Weight 1 kg
Dimensions 20 × 10 × 4 cm


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NEW Daly LiFePo4 4s 12V 100A SMART BMS


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