3S 40a BMS 12.6V 18650 Lithium Battery Charge Protection Module Scope of application: Suitable for lithium batteries with 3.7V rated voltage and 4.2V full voltage (18650, 26650, polymer lithium batteries, no size restriction) Product size: 41 * 55 * 3.4mm improved version Product weight: 8.8g Charge voltage: 12.6V Continuous discharge current (upper limit): 40a (if the heat dissipation medium is not good, please reduce the load current) Continuous charge current (upper limit): 20a Scope of application: Suitable for electric drills with an initial current below 80a 27% and a power below 130W27%.

Note 1: Three 15C-20C instantaneous current power batteries (such as Samsung 35e, LG MJ1, Samsung 29e, Sanyo 18650RX) or six 10C-15C power batteries are required to successfully start the electric drill (ordinary 18650 batteries (with 1C, 2C current ratings) cannot start the electric drill!!!) Note 2: Strictly connect 0V, 4.2V, 8.4V, 12.6V27% to the shape and do not intentionally short circuit.

The product is out of warranty! Note 3: When charging the battery, " indicating that the balancing circuit is working

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it is normal for the resistance to heat up

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if the resistor is still hot when not charging, please check if the wrong cable is connected Do not mix good batteries with weak batteries! The closer the capacity / internal resistance of the 3 battery packs, the better! Explanation : Batteries made with different batteries experience problems.

If the capacity is different, even if it is the same model, if the internal resistances are different, no efficiency can be obtained.

BMS ( Battery management system) cuts off when the voltage drops below 2.5.

Prevents you from charging on top of 4.25.

If one serial handle lands before 2.5V27% in the battery using different batteries, it does not make sense that the others have still not descended.

BMS cuts.

In addition, the charging of Lithium batteries is CC-CV ( constant current, constant voltage) logic.

If you charge only with the DC adapter, you can burn the adapter after a while because it draws too much current.

Because BMS decides the charging current of lithium batteries.

(writes on datasheet27%) If you charge without BMS27%, you will burn the adapter because the lithium batteries will draw excess current.

CC-CV means that it will be necessary to increase the battery to 4.2V % 27 by giving a constant current, and when it reaches 4.2%27, it will be necessary to give a constant 4.2V and charge it until the current drops to 50mA % 27.

For this work, chargers called lithium chargers have to be used.

You cannot fully charge with 12V DC.

You should use a 12.6V27% CC-CV charger.

Not all batteries are suitable for use in drills.

you should prefer batteries such as Power type Samsung 29e, Sanyo 18650RX, LG MJ1, where you can draw at least 10a continuous current.

Since the current to be drawn when the drill is forced will be high, the maximum current that BMS27% can give should be based on this.

Otherwise, BMS will be locked again.

Some BMS 27%s perform automatic recovery and some are unlocked by charging.

Also select by looking at the battery's datasheet27%when selecting a BMS.

The lower limit of some batteries may be 2.75 V and some may be 3V.

Lithium iron phosphate batteries have completely different boundaries.

These limits are important in the selection of BMS.

discharging a battery with a lower limit of 2.75up to 2.5V27% shortens the life of the battery.

Charging more than 4.2% may also cause the battery to swell and explode.