How to charge everstart jump starter 750 amp

Have been trying to follow the instructions on how to use this but the engine icon on the device's LED screen is not changing to a solid state. The instructions say the engine icon should be flashing when the clamps are connected properly, and then when switching the jumper switch to on, the engine icon should become solid indicating it's ready to start the battery. But when switching the jumper to on, the engine icon is still flashing. Do I need to wait, or do I need to try reconnecting the clamps? I am not sure what is wrong.

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How long does it take to charge a everstart Maxx jump starter?
Is 750 peak amps good for a jump starter?

Amazon.com: UpBright AC in Power Charging Cord Recharge Cable Plug Compatible with EverStart Plus 750 Peak Amps Jump Starter Ever Start 750A JUS750CE 750 Amp 12V 375A Start JumpStarter w/ 120 PSI Air Compressor : Electronics

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Brand	UPBRIGHT
Voltage	12 Volts
Amperage	750 Amps
Peak Output Current	750 Amps

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Tested Units. In Great Working Condition. UpBright 30 days money back guarantee. 1 full year service warranty.
UpBright New 2-Prong AC IN Power Charging Cord Outlet Socket Charger Cable Plug Lead Compatible with EverStart Plus 750 Peak Amps Jump Starter Ever Start 750A JUS750CE 750 Amp JumpStarter with 120 PSI Digital Air Compressor 12V 375A 375 Instant Starting Amps Jump Start 12 Volt Rechargeable Battery Power Source 120V 60Hz 9W Recharge Unit with Built-In 120V AC Charger and Household Electrical Cord
⚠️!!!Note: Rechargeable batteries don't last forever, the average battery last 1 to 3 years. If the battery is old/dead, it will not accept a charge. But not charger's problem. If you're not sure whether battery or charger is dead or not. You must have a volt meter in order to tell whether or not a charger is working.
(⚠️!!! If your Jump Starter has been around for years. Before purchasing this charging cable, make sure it works properly. ⚠️ This power cable is a lead. If it does not charge the Jumpstarter. it's usually the Jumpstarter's fault, but not the power cable.)

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Note: Products with electrical plugs are designed for use in the US. Outlets and voltage differ internationally and this product may require an adapter or converter for use in your destination. Please check compatibility before purchasing.

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Product Description

UpBright New 2-Prong AC IN Power Charging Cord Outlet Socket Charger Cable Plug Lead Compatible with EverStart Plus 750 Peak Amps Jump Starter Ever Start 750A JUS750CE 750 Amp JumpStarter with 120 PSI Digital Air Compressor 12V 375A 375 Instant Starting Amps Jump Start 12 Volt Rechargeable Battery Power Source 120V 60Hz 9W Recharge Unit with Built-In 120V AC Charger and Household Electrical Cord CECCCROHS

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Product information

Item Weight	3 ounces
ASIN	B01GP9M6I8
Item model number	EverStart 750 Jump Starter AC Power Cord
Customer Reviews	4.3 out of 5 stars
Is Discontinued By Manufacturer	No
Date First Available	June 6, 2016
Manufacturer	upbright

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There are 0 customer reviews and 16 customer ratings.

How long does it take to charge a everstart Maxx jump starter?

Mine is 51 amp/hours. 51 divided by the charging rate of 1.25 amps per hour means it took 40.8 hours to charge fully, 32.6 hours to charge to 80% so the battery can be used.

Is 750 peak amps good for a jump starter?

This 750 peak amp jump starter delivers enough power to start up small passenger cars and power-sport vehicles. The jump starter features a high-performance 9 Ah sealed lead-acid battery that delivers up to five jump starts on a single charge.

charge everstart jump starter amp