Will it automaticly stop charging once it is fully charged? If not, what accessory should I get to make it stop charging?

The battery doesn't have an internal mechanism to stop the inflow of charging power. I use a Schumacher 100 Amp digital (smart) charger for charging on the grid and a Sunforce 30Amp digital charge controller for off grid (solar) charging. They charge at a high rate when the batteries are low and slow to a trickle when maintenance level is reached. My system has 4 ea. 125AHr Vmaxtanks.

How long at max draw (125 amps an hour) does it take for this battery to rundown to the 50% level with no charge input

Amp hours are a measure of power. Theoretically, the battery should provide 125 amps for one hour at the stated 12 volts. However, at this high a current, I wouldn't count on it. More realistically, the battery should provide 10 amps at 12 volts for 12.5 hours or 20 amps for 6.25 hours...and so on and so forth. My experience is limited because I use them (two of them) along with an inverter to run a refrigerator and a few other pieces of equipment in a back up mode. They have done great when I've needed them!

What is the recommended depth of discharge for this battery?

Not sure I just have it hooked up to my solar panels and it never past 12.3v

just charge to 100%. Volt meter now shows that it is loosing a charge...down 15% in three minutes and continuing to slide. Do I need to do something?

Your battery made need to be replaced if it can’t hod a charge.

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SLR125 AGM Battery for Sump Pump Emergency Backup and solar Generators 12V 125AH.

SLR125 AGM Battery for Sump Pump Emergency Backup and solar Generators 12V 125AH.

Product ID: 1746316

Details

Battery Capacity
125 amp_hours
Battery Cell Composition
Lead-Acid AGM
Brand
VMAXTANKS
Item Weight
75 pounds
Product Dimensions
6.8"D x 12.9"W
Size
Group 31

⚡12V heavy-duty power

🔋125Ah high capacity

🛡️8-10 year float life

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Description

🔋 Power your independence with VMAXTANKS — never get left in the dark again!

VERSATILE CHARGING - Compatible with AC, solar, and wind power sources for ultimate off-grid freedom.
SAFE CLEAN ENERGY - 99% recombination AGM tech means zero harmful fumes or gases—perfect for indoor use.
POWER WHEN IT COUNTS - Delivers consistent 12V and 125Ah capacity for solar, wind, and emergency backup needs.
READY TO GO ANYWHERE - Compact Group 31 size with carrying strap and screw-in terminals for easy installation.
ENDURANCE THAT OUTLASTS - Military-grade AGM plates ensure up to a decade of reliable float service life.

The VMAXTANKS SLR125 is a 12V, 125Ah Group 31 AGM deep cycle battery designed for solar, wind, sump pumps, and emergency backup generators. Featuring military-grade custom plates and 99% recombination technology, it offers a safe, maintenance-free experience with an impressive 8-10 year float service life. Its versatile charging options and durable build make it a top choice for professionals seeking reliable off-grid power solutions.

Specifications

ASIN	B004DR3IIC
Battery Capacity	125 amp_hours
Battery Type	Lead-Acid, AGM
Best Sellers Rank	#388,726 in Health & Household ( See Top 100 in Health & Household ) #1,232 in Automotive Replacement Batteries #2,394 in 12V Batteries
Brand Name	VMAXTANKS
Compatible with Vehicle Type	Scooter
Customer Reviews	4.5 4.5 out of 5 stars (95)
Item Dimensions D x W x H	6.8"D x 12.9"W x 8.7"H
Item Weight	75 pounds
Manufacturer	VMAXTANKS
Manufacturer Part Number	SLR125
Manufacturer Warranty Description	1 YEAR
Model Number	SLR125
Number of Items	1
Size	Group 31
Terminal	Ring Terminal
UPC	729440163129
Unit Count	1 Count
Voltage	12 volts

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$1496.26

Duties & taxes included

In stock

Sold byAmazon USADelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to USA.

Secure transaction

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TrustScore 4.5 | 7,300+ reviews

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