what is the internal resistance of one of these batteries?

Thank you for your question, the internal resistance is around 30-50 milliohms.

Can this be used to power a 12v winch

Thank you for your question, you need to check what is the working current of power a 12v winch, the working current of our 36Ah battery is 36A, if the current is less than or equal to 36A then you can use it.

Can 6 of these be hooked up in series? my ups has a 72v setup. i would like to use these batteries instead but can’t find specifics.

Thank you for your question, there is no substitute as our batteries can only be connected in series with a maximum of 4.

Can this be used with a Batcaddy golf cart?

Thank you for your question, yes, if you are using two or more batteries in series, it is recommended that you use a Lifepo4 charger to charge the batteries.

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NERMAK 12V 7Ah (7.2Ah) Lithium LiFePO4 Deep Cycle Battery, 2000+ Cycles Lithium Iron Phosphate Rechargeable Battery for Solar Powar, Lighting, Power Wheels, Fish Finder and More, Built-in 8A BMS

Product ID: 589619435

Details

Battery cell composition
Lithium Ion
Brand
NERMAK
Size
12V 7Ah
Vehicle service type
Fish Finder
Voltage
12.8 Volts

⚡8A continuous discharge

🔋2000+ cycles lifespan

🔌Built-in 8A BMS protection

Description

🔋 Power your life smarter, longer, and safer — don’t get left in the dark!

SMART SAFETY TECH - Integrated BMS guards against overcharge, discharge & short circuits
UNMATCHED LONGEVITY - Outlasts traditional lead-acid by 4x with 2000+ reliable cycles
POWERFUL CONSISTENT - Delivers steady 8A continuous output for demanding devices
VERSATILE COMPATIBILITY - Perfect for solar setups, emergency lighting, power wheels & more
LIGHTWEIGHT MAINTENANCE FREE - Cut the bulk and hassle with a compact, zero-maintenance design

The NERMAK 12V 7.2Ah LiFePO4 deep cycle battery offers a cutting-edge lithium iron phosphate chemistry that ensures over 2000 charge cycles, built-in 8A battery management system for enhanced safety, and a robust 8A continuous discharge rate. Ideal for solar power, emergency lighting, and outdoor electronics, this lightweight, maintenance-free battery is a superior, eco-friendly alternative to traditional lead-acid batteries.

Specifications

ASIN	B0B78HTRDL
Battery Capacity	7 amp_hours
Battery Type	Lithium Ion
Best Sellers Rank	#69,981 in Electronics ( See Top 100 in Electronics ) #525 in Rechargeable Household Batteries
Brand Name	NERMAK
Compatible with Vehicle Type	Fish Finder, 12V Routers,Game Cameras,Radio
Customer Reviews	4.3 4.3 out of 5 stars (368)
Item Dimensions D x W x H	15.1D x 6.5W x 9.4H centimeters
Item Weight	2 Pounds
Manufacturer	NERMAK
Manufacturer Part Number	12V 7A
Model Number	12V7A
Number Of Cells	4
Number of Items	1
Size	12V 7Ah
Terminal	F2 Terminal
Unit Count	1.0 Count
Voltage	12.8 Volts

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