How to force 6V charging mode to 12V?

If the charger accidentally recognizes the 12V battery as a 6V battery (for example, the power of 12V battery is less than 6 Volts), you can press and hold the Mode button for 5 seconds, and the charger will be forced to switch to the 12V charging mode.

Will this work for 12v interstate batteries deep cycle 840 marine cranking amp battery?

Yes it will work. It is also a 6 volt charger select which battery you are charging. This charger has worked good for me

Can you adjust the amps?

No adjustment plug it in it's automatic

Does thus work on Marine gel batteries?

I charged a geĺ battery for a flashlight. It worked. Iuse this too keep my mower battery charged. Ìt works great

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1.75-Amp Car Battery Charger, 6V and 12V Smart Fully Automatic Battery Charger Maintainer, Trickle Charger, Battery Desulfator for Car, Lawn Mower, Motorcycle, Boat, Marine Lead Acid Batteries

1.75-Amp Car Battery Charger, 6V and 12V Smart Fully Automatic Battery Charger Maintainer, Trickle Charger, Battery Desulfator for Car, Lawn Mower, Motorcycle, Boat, Marine Lead Acid Batteries

Product ID: 447846454

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Details

Brand
NEXPEAK
Color
1P-NC175
Product Dimensions
2.2"D x 3.8"W
Item Weight
0.26 Kilograms
Output Voltage
12 Volts (DC)

⚡1.75A smart charging power

📊LCD screen with real-time status

🔋Supports 6V & 12V lead-acid batteries

Description

🔌 Charge smarter, live freer — never get stranded again!

4 IN 1 POWERHOUSE - Charger, maintainer, trickle charger & desulfator in one compact device
BATTERY REVIVAL TECH - Advanced pulse repair restores old batteries and extends lifespan
PLUG FORGET SAFETY - Auto cut-off & multi-layer protection for worry-free long-term charging
SMART VISUAL FEEDBACK - Intelligent LCD screen displays charging %, voltage & current for total control
VERSATILE COMPATIBILITY - Perfect for cars, motorcycles, boats, lawn mowers & more with 6.6ft cord

The NEXPEAK 1.75-Amp Car Battery Charger is a compact, fully automatic 4-in-1 device designed for 6V and 12V lead-acid batteries. Featuring an intelligent LCD screen, advanced battery desulfation and pulse repair technology, it ensures efficient charging and extends battery life. With comprehensive safety protections and versatile compatibility across vehicles and powersports, it’s the ultimate plug-and-forget solution for maintaining peak battery performance.