Description

B-Grade LiFePO4 12v 50A 4s Battery, SLM12-B

PLEASE READ THE DESCRIPTION CAREFULLY.

Shipping to Lower 48 USA states only via Fedex Ground Shipping. No international shipping including Hawaii, Guam, Puerto Rico. Non-USA customers click here.

B-Grade battery. 12v 50Ah 600Wh LiFePO4 energy storage in 4s configuration using A123 LFP cells. Capable of continuous power output of 50A from the battery terminals. The reason these are B-Grade is because they are made up of cells that are not matched. Safer LFP chemistry, better temperature stability and tolerance compared to regular li-ion 18650 cells.

There is no BMS on these cells > LiFePO4 BMSs sold separately here. See BMS PCB video here.

NOTE: For any lithium iron phosphate batteries, state of charge cannot be determined by voltage alone, you need to count Amp Hours or Watt Hours. Typical behavior is for the “Resting Voltage” to be 13.2VDC a few hours after your charging session.

** NOTE: To get an accurate shipping price when buying more than x4 sets, email [email protected]

A-Grade 12v 50A version available HERE!
12v 100A version available HERE!
24v 50A version available HERE!

Use as an Expansion Battery:

This battery pack can serve as an expansion battery. Connect multiple in series to increase the charging speed (volts), or connect multiple in parallel to increase capacity and current (amps), see your device specs for max limits. Use with:

EcoFlow Delta Max 2000 (Solar Charging Input 800W Max, 11-100V, 13A). May require an XT90 connector adapter.
EcoFlow Delta Max 1600 (Solar Charging Input 800W Max, 11-100V, 13A). May require an XT90 connector adapter.
EcoFlow Delta Pro (Solar Charging Input 1600W Max, 11-150V, 15A Max). May require an XT90 connector adapter.
EcoFlow Delta Mini (Solar Charge Input 300W 11–75V DC 10A max). May require an XT60 connector adapter.
Bluetti AC300 (Solar Input 2,400W Max., VOC 12-150VDC, 12A). May require an XT60 connector adapter.
Bluetti AC200 Max (Solar Input 900W Max., VOC 10-145VDC, 15A). May require an XT60 connector adapter.
Bluetti EB240 (PV Max Input Power MAX 500W/10A, OCV 16V~68V /MAX10A). May require an XT60 connector adapter.
EcoFlow River (Solar Charge Input 200W 10-25V DC 12A Max). May require an XT60 connector adapter.
EcoFlow River Max (Solar Charge Input 200W 10-25V DC 12A Max). May require an XT60 connector adapter.
EcoFlow River Pro (Solar Charge Input 200W 10-25V DC 12A Max). May require an XT60 connector adapter.
Bluetti EB70 (Solar Input 200W Max., VOC 12-28V, 8A). May require an XT60 connector adapter.
Bluetti EB55 (Solar Input 200W Max., VOC 12-28V, 8A). May require an XT60 connector adapter.
Bluetti AC50S (12V/24V AC-Solar-Car-Generator Recharge). May require an XT60 connector adapter.
Similar spec portable power stations.

Pack Specifications:

Battery Type: 12v
Battery Type: Lithium Iron Phosphate
Battery Capacity: 50Ah
Watts: 600w
Continuous Power Output: 50A
Cycle Life: ~6000 cycles
Module Dimensions: 2.5″ x 9.25″ x 12.25″
Recommended Charging Voltage: 14.6VDC
Resting Voltage (after 12 hrs): 13.2VDC

Cell Specifications:

Size: WX1213250
Type: Rechargeable
Voltage: 3.2V
Chemical Composition: Lithium ion
Charging Cut-off Voltage: 3.65V
Discharging Cut-off Voltage: 2V
Max Pulse Discharging Current: 125A (5C)
Max Continuous Discharging Current: 75A (3C)
AC Impedance: ≤1.2mΩ
Dimension: 267x240x11.2mm
Weight: 1171g
Max Continuous Charging Current: 50A (2C)

** NOTE: To get an accurate shipping price when buying more than x4 sets, email [email protected]

Other parts you may need (This will require you to order all the components and assemble it yourself by soldering components into the board):

16pin IDC connector (male) – https://amzn.to/3pkLNjq
5 – 16pin IDC Connector (female) – https://amzn.to/3pka09u
6 – 16pin IDC Ribbon Cable – https://amzn.to/3Qr7bzf
7 – XT90 Connector (female) – https://amzn.to/3zYQFiU
8 – XT60 Connector (female) – https://amzn.to/3C6aAzo
9 – Standoffs (M5x25) – https://amzn.to/3QJLOsJ
10 – M5 Nuts – https://amzn.to/3bS5SKS
BMS module – https://amzn.to/3C5M0OL
PCB (Download) – https://www.pcbway.com/project/shareproject/12v_50Ah_LiFePO4_Pack_BMS_Open_Source_board_9e358ca3.html

Charging

We recommend fully charging this pack as soon as you receive it. Charger not included.

Product video:

___

Note that these are reclaimed cells. These items are sold for DIY and Second Life purposes. Listings that are “untested” as sold as-is and cannot be returned, exchanged or refunded. We make no guarantees that all cells will be usable. Even when sold as “new”, “NOS”, or “like-new”, they may be in less than perfect condition. Buyer is responsible for proper cell recycling/disposal. Sold as-is. No refunds.

If you buy a product from us and then realize you don’t have, or don’t want to acquire, the tool(s) or information needed to make our product(s) work for your specific build, this does not constitute valid grounds for replacements, exchanges or refunds. You are responsible for doing your due diligence before making any purchases.

NEW YORK residents:
On 3/2/2023 New York passed a law banning the sale of lithium-ion batteries for mobility devices that are not certified to UL 2271, and the assembly and reconditioning with cells removed from used batteries for commercial sale within the state of New York (more details here). New York residents, you are solely responsible for researching, understanding and complying with all pertinent regulatory rules, laws, statutes, and NY safety standards.

Safety is important to us, we don’t want people to get hurt or property to get damaged, especially when working with DIY and/or second-life lithium-ion batteries. All batteries everywhere are inherently dangerous, so we urge all who work with DIY and/or second-life lithium-ion batteries to take safety seriously so as to avoid causing any harm to self, others or property.

B-Grade LiFePO4 12v 50A 4s Battery, SLM12-B Online Sale