Question 1

Why does setting it to 5a/10a agm and output into 15a cig-lighter connected to agm battery destroy every electric device in the car? Input: wall outle

Accepted Answer

I'm sorry, but you don't know how to use this unit properly.  You destroyed everything connected to this unit.   This if for charging a battery.  Separately.   Disconnect everything.  Disconnect the battery.  Then... Charge the battery.  Alone.  Separately. Only connect to the battery, and the battery, alone.  BTW: this is a pretty good battery charger, for many different types of batteries.

Question 2

Is it safe to charge my Lifepo4 12v battery at 20a setting?

Accepted Answer

As long as your battery is 40AH or larger.

It is incorrect that the battery BMS controls the charging rate.  The BMS will stop the charging completely if the charging voltage exceeds a certein limit but it does not control the charging rate.

The charger charges at 20A (not really, see below) until the voltage reachs 14.6V and then the current is smaller, maintaining 14.6V.

The problem with this charger is that the wires are too small so you never get 20A.  The most you would get is 15A.

Question 3

Is this compatible with charging LTO?

Accepted Answer

All lithium chemistry is compatible and even better: lead acid needs to be full to last where LIFEPO4 or others last longest at 50%…. Lead acid charging at 80% of a real lithium charge mode… meaning you actually will have a lithium battery for twice as long as a lead acid if you use it in vehicles. It has all the modes in the charger so it will charge it completely full with the charger, which is great if you use it a lot before running a car or using it. Be aware when you let it sit put it at 60%

Question 4

I purchased one of these chargers, can I get a second one and run them in parallel

Accepted Answer

For LIFEPO4 batteries it does not really matter as long as the battery size matches the charging current. Recommended 1/2C meaning half of the Amp hour capacity in amp is the recommended max charging speed. Example 100Ah battery you can charge with up to 50 amp so using 2 20Amp chargers is fine but not 2 35Amp chargers, I would get a 200Ah battery to charge it with 2 35Amp chargers

ASIN	B09ZLD6RJ5
Amperage	20 Amps
Brand	Haisito
Brand Name	Haisito
Colour	black
Country of Origin	USA
Current Rating	20 Amps
Customer Reviews	4.4 out of 5 stars 173 Reviews
External Testing Certification	Não aplicável
Input Voltage	24 Volts
Item Dimensions D x W x H	19.4D x 6.8W x 17.1H Centimeters
Item Weight	1.23 Pounds
Item Weight Unit of Measure	1.23 Pounds
Manufacturer	Haisito
Manufacturer Part Number	P20
Model Number	EF-20
Number of Ports	1
Output Voltage	12 Volts
Product Dimensions	19.4D x 6.8W x 17.1H Centimeters
Specification Met	SLA
UPC	194230253630

20AmpLithiumBatteryCharger, 12Vand24VLifepo4, Lead Acid (AGM/Gel/SLA。) Portable CarBatteryCharger, BatteryMaintainer, TrickleChargerandBatteryDesulfatorforCar,Boat,Motorcycle

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