18.5V 19V 4.74A USB Universal notebook Charger Laptop Adapter for acer aspire ac adapter charger power supplies For Lenovo

18.5V 19V 4.74A USB Universal notebook Charger Laptop Adapter for acer aspire ac adapter charger power supplies For Lenovo
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Oписание продукта

RFNT3 Universal Laptop Battery Tester Charger Discharger


Support the operation of Smart battery;

Provide charging, discharging, testing, capacity correction, charging and discharging to 50% functions;

Using LCD display battery information, led indicating working status (charging, discharging, charging and discharging etc.);

have charge, discharge, backlight, function key;

Charge-charging, fast charging, constant pressure charging stage, and constant current, constant pressure value range less than 1%;

can be transferred to the constant discharge power;

Online function, connect with the computer through the USB interface, the upper computer can monitor the instrument work.


Basic parameters

Size: 201 x 99 x 35 mm

Weight: 330g


Input 100~240v, output 24V 2.65A

Display mode

With white backlight segment LCD + red-green monochrome LED

Discharge mode

Constant-current power, default 500mA, Max 1000mA, can be set by BM (Battery Manager-Battery management software, hereinafter referred to as BM) setting discharge currents, external electronic load, maximum discharge current can increase to 3 a

Charging mode

Mainly constant current + constant pressure (CC+CV), in addition, depending on the battery voltage, may also include activation, preload. Activation: When the 0V battery is connected to the instrument may not be recognized, press the charge key will start the activation function.

When the battery communication is restored, the battery is activated and automatically transferred to normal charge.

Pre-charging: When the single voltage is below 3000mV, the preload is carried out. Constant current: The single section voltage is higher than 3000mV but below 4200mV, carries on the fast charge.

The fast charge flow varies with the battery design capacity.

Charging is over: the current will gradually decrease when it enters a constant voltage charge, and the charge ends when the current is reduced to a terminating current, or the electricity is 100% and the current is less than 1 a.

Charging current

The maximum charge current is 2.5A. The current is related to the charging mode.

Specifically as follows:

Design capacity, pre-charging flow, fast charging flow, terminating current

≧6000 400 2500 300

≧3500 400 2000 200

Other 200 1000 100

In particular, when the battery is just connected, if (Set_fastvol-bat_vol) 400, the additional calculation of the fast charge flow and termination of the current, so as to avoid the initial current too large, but also ensure that the battery fully charged.

Standby power


Operating temperature

0-40 ℃, 20%-90% RH (Non condensing)

Storage temperature

-20℃-65℃, 10%-95% RH (Non condensing)


Charging time limit of 8.8h;

discharge time limit 8.8h;

Test time limit 20s+10s;//Chg+disc (charge + discharge)

Battery correction Time 8.8h+20s+8.8h;//DISC+PAUSE+CHG (discharge + suspend + charge)

 Function menu No button automatic exit time 10s;

 function Introduction

Charging Charge is divided into: activation, preloading, constant current, constant pressure several stages.

The initial charging mode of the battery depends on the initial voltage of the battery, and the charging process may not require activation and preload.

Charging mode and current reference "Basic parameters" section of "Charging mode" and "Charging current"

Charging natural termination meets one of the following conditions:

1, the electricity ≧99, the current is 0;

2, full power, that is, RMC = FCC; remaining capacity = full capacity

3. The current is reduced to the terminating current when the constant voltage is filled;

 Charging end Additional condition: the electricity reaches the set value


There is a discharge circuit in the instrument, which can discharge the battery.

The default discharge current 500mA, can be set by BM discharge Current, maximum 1000mA.

Dual-load constant-current:

Internal load: [0, 1000] ma continuously adjustable, via BM setting;

External load: [0, 1000, 1500, 2000]ma has 5 files optional, by dialing the switch to choose.

Discharge termination meets one of the following conditions:

1, the electricity ≦ set value;

2, voltage ≦ set value;

3, discharge to the current of 0.


The discharge is constant-current, but there is a little deviation between the set value and the actual value, and the specific value is related to the battery.

Battery test

Through the battery for a short period of charge and discharge, test battery charge, discharge function is intact. Time limit 30s.

After testing the LED green Flash, and LCD display results:

Normal, LCD display  "Test ok";

Abnormal, display on LCD  "Test NG."

Possible causes and countermeasures for testing exceptions: 1, low battery voltage, resulting in discharge failure.

Try to charge the battery, increase the voltage and then test; 2, the battery is too high, resulting in a failure to charge.

Try to give the battery discharge, after the battery clear "full power" mark after testing;

3, the battery connection line bad contact;

4, instrument failure or battery is bad.

 Electricity correction After several cycles of battery, the management chip recorded in the battery and the actual amount of electricity generated deviations, when the deviation reached a certain degree will affect the normal use.

The Power correction function modifies the power value recorded by the management chip by a full discharge of the battery and a full charge of the battery.

Attention: The discharge process follows a general discharge. If the end of the electricity and voltage are set very low, the discharge process may appear "battery line off" phenomenon. The reason is that the battery does not communicate properly due to a deep discharge.

In this case, as long as the battery activation charge can be.

50% Electricity

cd50%: First charge after discharge to the full charge of 50%

dc50%: First discharge after the charge to the full charge of 50%

(As with the power correction function, the charge and discharge are subject to the general charging and discharging termination conditions.)

Online features

The instrument can be connected with the PC software by the USB interface and BM can realize the monitoring, control and parameter setting of the instrument work.

Monitoring 3 Interface Display