Will this power a 12v 25ah winch

I wouldn't do it for long. A battery's charge level will drop exponentially and will be useless for attempting to operate anything well before it reaches zero volts. A 20 amp hour battery will deliver 1 amp of discharge for about 20 hours before it's completely flat. a 25 amp winch would draw this battery to completely flat, no charge in less than an hour. Realistically, the winch would become too weak to pull anything in less than 10 minutes. For using something like that, you'd want a full sized deep cycle battery that's about the size of a car battery. I'd recommend at least 100ah capacity.

This is a standby/lighting battery, not a vehicle battery. It does not have a CCA rating.

what gauge wire should i use?

It depends on the load. I have 12 gauge for 30 amp Ham Radio operation.

Battery is fully charged. Why did battery votage just get 10.3V?

30 year master tech here. THE REASON YOUR BATTERY DID NOT COME ALL THE WAY UP TO 12V IS BECAUSE IT HAS BEEN SITTING ON A SHELF FOR SO LONG IT HAS A BAD CELL.

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WEIZE 12V 20AH Lead Acid Battery Replace UB12200 FM12200 6fm20 EXP12200 12V 20AH 22AH Batteries

WEIZE 12V 20AH Lead Acid Battery Replace UB12200 FM12200 6fm20 EXP12200 12V 20AH 22AH Batteries

Product ID: 343618238

Details

Battery cell composition
Lead Acid
Brand
WEIZE
Number of batteries
1 12V
Recommended uses for product
Scooter Toys
Unit count
1.0 Count

⚡20AH Capacity

🔋12V Power

🛠️AGM Technology

Description

🔋 Charge Ahead with Confidence!

RUGGED READY - Built to withstand the toughest conditions.
MAINTENANCE FREE - Enjoy hassle-free performance with no upkeep required.
POWER UP YOUR LIFE - Experience reliable 12V energy for all your devices.
USER FRIENDLY DESIGN - Quick and easy installation for immediate use.
UNMATCHED VERSATILITY - Perfect for everything from scooters to solar power.

The WEIZE 12V 20AH Lead Acid Battery is a high-performance, maintenance-free battery designed for a wide range of applications, including mobility scooters, lawn tools, and emergency systems. With its durable construction and advanced AGM technology, this battery ensures reliable power delivery and easy installation, making it an essential choice for both personal and professional use.

Specifications

ASIN	B07TG7PJ41
Amperage	20 Amps
Antenna Location	Scooter, Toys, Wheelchair
Battery Cell Type	Lead Acid
Best Sellers Rank	#226,986 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #1,115 in Cordless Tool Accessories #2,557 in Outdoor Power Tool Accessories
Brand	WEIZE
Customer Reviews	4.4 4.4 out of 5 stars (1,185)
Item Dimensions	18.1 x 16.7 x 7.7 centimeters
Item Weight	4.2 Kilograms
Manufacturer	Weize
Number of Batteries	1 12V batteries required. (included)
Reusability	Rechargeable
Unit Count	1.0 Count
Voltage	12 Volts

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