Connect the car battery to the tester: red wire to positive terminal, black wire to ground terminal. The left LED lights up when correctly connected, the right side lights up when incorrectly connected.
Press and hold the toggle load switch for 5 - 10 seconds (mute or monitor count), not more than 10 seconds, otherwise the wire resistance will melt due to high temperature. Load tester wire resistance design, when using the coil is hot and red, smell or smoke is normal, discharge current 100 - 200A.
Refer to the dial scale and judge according to the battery cranking amperage.
Check the charging system, connect the tester and start the car, the indicator should be around 13.5 - 15 volts. Press the toggle switch or turn on the high beams to see if the charging system is working properly to determine if there is a problem with the battery or charging system.

First, the vehicle can not start. Driving battery is dead, automotive electronic system failure, power steering failure makes the steering wheel heavy, braking force weakening increase braking distance, easy to cause accidents. At night or in bad weather, visibility is low and signals are difficult to transmit, increasing the risk of collision. On-board electronic equipment stops working, affecting comfort and convenience. If the engine stalls in special places, it may lead to serious accidents.

Yes, many suppliers offer samples of lithium batteries for testing and evaluation purposes. However, there are costs associated with obtaining samples, including sample fees and freight charges.

Lead times are typically 15 to 30 days for mass production and as fast as 7 days for stock models. Delivery times for customized products are 20 to 25 days.