Does battery charger have a safety feature to prevent constant charging overheating of already bad batteries if the voltage stays low?

This lead-acid charger will not turn off automatically when it is fully charged, but will enter the final stage of floating charge, and charge with a small current trickle to keep the battery fully charged and will not overheating and overcharge.

How can I get it out of 6v and into 12v mode? It doesn't change automatically.

Sounds like it may be defective. If the leads are connected to a 12V battery, and power lead to-110v, it should sense that and go to 12V mode. If your battery is completely dead, perhaps there isn’t enough voltage for it to detect? Try a hot batt. Maybe? If it still stays on 6V then it is indeed defective. Hope this is of some help.

Only light on is the mode led =6v. Battery is new but installed and sitting over a year. Will it eventually charge if under the 3v?

Sorry to say I have only trickle charged as Low as 6 volt. ie (lawnmower and Quad batteries). But a trickle charge is just that. Very very small charge to enlighten power in the battery for long term winter storage in my case. If the battery still has life in the cells I believe it should take a charge. If you hook up the T- Charger and the battery is bad it will tell you NG. When my mower battery went bad it would knock off and red light to signal no charge.

What will be the maximum voltage on a 12v lead acid battery before it cycles off and at what voltage will the unit cycle back on?

My agm 12 volt will increase to 13.4 volts which is normal for it when full. Then goes into maintenance. Very few 12 volt batteries are exactly 12 volts. Nost are between 12-14 when at capacity. No danger.

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🔌 Power up smartly, stay charged effortlessly!

ADVANCED SAFETY SUITE - Built-in protections against reverse polarity, short circuits, overcharge, overload, and overheating for worry-free use.
SMART 5 STAGE CHARGING - Automatically optimizes battery health with quality inspection, soft start, bulk charge, absorption, and maintenance phases.
UNIVERSAL COMPATIBILITY - Supports all 6V/12V lead-acid battery types across cars, motorcycles, boats, lawnmowers, and more—one charger to rule them all.
COMPACT PORTABLE DESIGN - Lightweight and travel-ready with a wide 100-240V input, perfect for on-the-go professionals who demand convenience.
INTUITIVE LED STATUS INDICATORS - Real-time charging feedback and diagnostics keep you informed, so you never miss a beat on battery health.

The Unocho 6V/12V Battery Charger is a compact, intelligent trickle charger designed for lead-acid batteries. Featuring a 5-stage automatic charging process and comprehensive safety protections, it ensures optimal battery maintenance and longevity. Compatible with a wide range of vehicles and equipment, it offers intuitive LED indicators and portability, making it the ultimate smart charger for busy professionals.

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Item Weight	0.2 Kilograms
Item Dimensions D x W x H	3.1"D x 5.1"W x 3"H
Color	6/12V 1.5A
Energy Specifications Met	sae
Battery Charge Time	24 Hours
Current Rating	1.5 Amps
Input Voltage	240 Volts
Output Voltage	12 Volts

Unocho 6V 12V Battery Charger 1.5A Automatic Smart Charger Battery maintainer trickle,Float Charger for auto car Motorcycle Lawn Mower Boat Snowmobile

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