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Foursun
Foursun 12V 300Ah LiFePO4 Battery with Low-Temp BMS Protection

Foursun 12V 300Ah LiFePO4 Battery with Low-Temp BMS Protection

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$386.99at AmazonObserved at 7:36 PM

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Our take on the Foursun 12V 300Ah LiFePO4 Battery with Low-Temp BMS Protection

The Foursun 12V 300Ah is a lithium iron phosphate (LiFePO4) deep-cycle battery with a built-in BMS that includes low-temperature charge protection. It is rated for over 4,500 cycles and comes in an ABS case rated IP67, so it can handle damp or dusty installs. Its best new price is $297.50 at eBay as of November 5, 2026, with two stores listing it new. That is roughly $1 per amp-hour, which is low for a 300Ah LiFePO4 pack, so check the seller's warranty and return terms before buying.

Best forVan and RV house battery banksOff-grid solar storageTrolling motor and marine useDIY power stations and backup builds
Pros
  • 300Ah capacity gives long runtime between charges
  • LiFePO4 chemistry is rated for over 4,500 cycles
  • Low-temp BMS protection blocks charging below freezing
  • IP67 ABS case suits damp marine and outdoor installs
  • About $1 per amp-hour at the $297.50 eBay price
Cons
  • Heavy for one person to lift and install
  • Low-temp protection limits charging in cold climates
  • No Bluetooth or app monitoring mentioned
  • Warranty and support depend on the seller
  • Charging needs a LiFePO4-compatible charger or solar controller

Foursun 12V 300Ah LiFePO4 Battery with Low-Temp BMS Protection prices at every store

  • AmazonNew

    Availability unknown

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    $386.99Free shippingObserved at 7:36 PM
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  • eBayCheck price at eBay

Foursun 12V 300Ah LiFePO4 Battery with Low-Temp BMS Protection price history

Lowest price we've seen: $386.99 on Nov 6 at Amazon. Tracked across 1 store since Nov 6.

Specifications

High Capacity
300 Ah for maximum autonomy.
Long Lifespan
Specified for over 4500 cycles.
Integrated BMS
Provides protective features, including low-temperature protection.
Robust Casing
ABS housing with an IP67 protection rating.

Questions and answers

Is $297.50 a good price for this battery?
At $297.50 at eBay as of November 5, 2026, it works out to about $1 per amp-hour, which is low for a 300Ah LiFePO4 pack. Compare it with the other new listing and confirm the seller's warranty before buying.
Can it charge in freezing weather?
The built-in BMS has low-temperature protection, so it should stop charging when the cells get too cold. That protects the battery, but it means you need to warm the battery or wait for milder weather to charge it.
What can a 300Ah 12V battery run?
It stores about 3.8 kWh, enough to run a modest RV or van setup for a day or more. A 1,000W load would draw roughly 80A, so size your inverter cables and fuses for high current.
Does it need a special charger?
Yes. Use a charger or solar controller with a LiFePO4 profile, typically around 14.4V absorption. A lead-acid charger can work short-term but may not fully charge it or may overcharge it.
Can I wire several together for 24V or 48V?
Series connection depends on the BMS rating, so confirm with Foursun or the seller before building a 24V or 48V bank. Parallel wiring for more capacity is the safer option if the manual allows it.
What is in the box?
Expect the battery itself and basic terminal hardware. A charger, mounting bracket and monitoring accessories are usually not included, so budget for those separately.
Where is the Foursun 12V 300Ah LiFePO4 Battery with Low-Temp BMS Protection cheapest?
At Amazon, for $386.99, as of our latest check.
Where can I buy the Foursun 12V 300Ah LiFePO4 Battery with Low-Temp BMS Protection?
2 stores we checked sell it, including Amazon, eBay.

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Buying guides that pick the Foursun 12V 300Ah LiFePO4 Battery with Low-Temp BMS Protection

  • Best 12V LiFePO4 deep cycle batteries for RV, solar and trolling motor use