# 18650 battery tester module, capacity, internal resistance, 10W

> 18650 battery tester module (Lithium-Ion, 1S), measures capacity, internal resistance, voltage, current and power. 1.77 inch color screen, two slots (power and test), charging via USB Type-C, discharge up to 1A with 10W dissipation (0-20W). Charge voltage 4.2V, discharge voltage 3.0V, capacity range 0-99999mAh. ON/OFF button, no internal memory.

- Page: https://sigmanortec.ro/en/18650-battery-tester-module-capacity-internal-resistance-10w
- Price: 68.86 RON
- Availability: In stock; 1-2 zile
- Reference: 9509 · EAN: 5942426387196
- Category: Electronic components > Testing and Measurement
- Specifications: Technology: Lithium Ion; Power: 0 - 20W; Number of cells: 1S
- Package (shipping data): 0.119 kg
- Updated: 2026-09-14
- Shop: [Sigmanortec.ro](https://sigmanortec.ro/en/llms.txt)
- Prices: RON, VAT included; prices and stock as of 2026-10-22 06:17 (Europe/Bucharest)

## Description

Compact tester for 18650 batteries, measures discharge capacity and internal resistance for quick assessment of cell condition. Clearly displays voltage, current, power and mAh on a 1.77 inch color screen, allows charging via USB Type-C and discharging up to 1A with 10W dissipation. Has two slots, one for power and one for testing.
Tester for 18650 batteries that can measure the capacity and internal resistance of the battery. It has a 1.77 inch color screen for displaying multiple information related to the tested cell and can charge and discharge the battery.
The displayed information is: Voltage, Current, Power, Capacity, Resistance.
The discharge current is up to 1A. The discharge is carried out through the two 10W resistors by heating them.
The module has two slots for 18650. The first is only for powering the module , the second is for testing the battery. Charging the test battery can only be done by connecting a charger with a USB Type-C plug to the dedicated port. To discharge the test battery, it is not necessary to use the USB port, but only an 18650 cell on the power slot.
There are two USB Type C ports on the module. One is used to provide the charging voltage when the battery is to be charged. The second one is used to download (it is linked to the test slot).
It has a physical ON/OFF button.
The module has no memory. Once the module is turned off or the operating mode is changed, the displayed values are reset.
The battery capacity is measured exclusively during discharge (battery capacity is measured only during discharge), the module not recording during charging but only during discharge.
The battery resistance is measured immediately after connecting the cell. This value is a reliable indicator for establishing the health status of a cell. This module is a hobby level one and the displayed resistance value is not very precise but it is enough to give us an idea about the state of a cell.
Depending on the batch, the discharge current can be set or not, the physical ON/OFF button not being present.
If the module arrives in Chinese, change to English by following these steps:
1 - Insert the battery into the power slot (Left).
2 - Switch the switch to the OFF position
3 - Hold down buttons 1 and 3 at the same time, switch to ON and release buttons 1 and 3
4 - If it does not work, remove the battery, wait 1 minute and try again
Specifications:
Supply voltage: 5VDC via USB Type-C or 18650 cell
Supported cell: 18650
Slot 1: 18650 cell for power (this cannot be tested)
Slot 2: 18650 test cell (this is tested)
Test 2 USB Type-C port: External download
Discharge power: 10W
Discharge current: 1A
Charging voltage: 4.2V, not adjustable
Discharge voltage: 3.0V, not adjustable
Charging current: 1A
USB power plug: Type-C
Measured capacity range: 0 - 99999mAh
Measured energy range: 0 - 99999mWh
Internal resistance measurement: Yes, with an error margin of approximately 10%