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Eiiev 12V LiFePO4 Battery, 100Ah1 / 7
Product guide

Eiiev 12V LiFePO4 Battery, 100Ah

The Eiiev 12V LiFePO4 Battery is listed as a 100Ah deep-cycle battery for energy storage in marine, RV, trolling-motor and similar setups. The listing describes a built-in 100A BMS and 4P4S expansion, but charging compatibility and its weight and voltage descriptions warrant attention before purchase.

At a glance

  • The listing identifies it as an energy-storage battery, not a starter battery.
  • The stated charger requirement is a 14.6V 20A charger with pulse function. The listing says standard lead-acid and automotive chargers are unsupported.
  • The listing claims up to four batteries in series and four in parallel, and says not to mix brands or battery types.
  • A 2-year warranty is stated, with consultation offered.
Price
$159.00Save 20%

Reference price: $199.99

Price checked: Nov 14, 2026

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Often bought together

Pros and cons

Pros

  • The listed 100Ah capacity and deep-cycle positioning suit buyers seeking energy storage for compatible 12V setups.
  • M8 terminals are specified, and the package list includes four M8 terminal bolts and four insulating caps.
  • The stated 4P4S maximum offers an expansion path for compatible system designs.

Cons

  • It is explicitly unsuitable for starting power, so it is not a replacement for a vehicle starter battery.
  • Charging requires a specific pulse-function charger, which limits use with ordinary automotive and standard lead-acid chargers.

Technical specifications

12 specifications
Identity
BrandEiiev
Model12V LiFePO4 Battery
Power and battery
Battery typeLithium Ion
Dimensions and installation
Dimensions listed6.9"D x 13"W x 8.7"H
Weight listed26.4 pounds
TerminalM8
Number of cells1
Voltage12 volts
Listing claims
Nominal capacity100Ah
BMS rating100A
Series and parallel configuration4P4S
Charger specification14.6V 20A charger with pulse function

What to know before buying

Listing details to confirm

The listing is inconsistent about nominal voltage, describing the battery as both 12V and 12.8V, and about weight, giving 26.4 pounds in product details versus 24.25 lbs in feature text. The model name and chemistry labels also differ between LiFePO4 and Lithium Ion. Confirm the selected listing's exact configuration and fit before buying. Follow its charger guidance and do not connect batteries of different brands or types in series or parallel.

What’s in the box

Included
  • 12.8V 100Ah Lithium LiFePO4 Battery
  • 4 insulating caps for bolts
  • 4 M8 terminal bolts
  • Instruction book

Who is it for?

A good fit for

  • RV, marine or off-grid energy storage buyers with a compatible 12V system and the specified charger.
  • Trolling-motor users whose system requirements match the battery's listed configuration and energy-storage use.

Less suited to

  • Anyone needing a starter battery for a car or other engine.
  • Buyers who need to use a standard automotive or lead-acid charger, or cannot verify compatibility with the specified pulse-function charger.
Eiiev 12V LiFePO4 Battery, 100Ah · photo 2
Additional product photo 2

Customer reviews on Amazon

4.3 / 5 · 327 ratings
  • 5 stars73%73%
  • 4 stars9%9%
  • 3 stars6%6%
  • 2 stars2%2%
  • 1 star10%10%

Customer feedback highlights perceived power and a lightweight design, but charging experiences are mixed: some customers say the battery holds charge after heavy use, while others report it will not take a charge. Views of battery quality and value are also divided. For buyers, the charging concerns matter especially because the listing specifies a pulse-function charger and describes a battery voltage check and possible BMS activation procedure. The overall rating distribution is mostly five-star but includes a notable one-star share, so the aggregate does not resolve those practical concerns.

Positive themes

  • Customers report plenty of power and appreciate the lightweight design.

Mixed feedback

  • Charging reports range from holding charge after heavy use to not accepting a charge.
  • Customer views of battery quality and value differ.

Frequently asked questions

Can this battery be used to start a vehicle?

No. The listing says it is for energy storage and not for starting power.

What charger does the listing specify?

It specifies a 14.6V 20A charger with pulse function and says standard lead-acid, automotive and non-pulse lithium chargers are unsupported.

Can batteries be connected in series or parallel?

The listing claims a maximum configuration of 4S4P, but says not to mix brands or battery types. Confirm system and battery compatibility before configuring a bank.

What weight and voltage should I plan around?

The details list 26.4 pounds and 12 volts, while feature text gives 24.25 lbs and calls it 12.8V. Verify the exact version with the seller or listing before installation.

Eiiev 12V LiFePO4 Battery, 100Ah · photo 3
Additional product photo 3

Alternative options

Offer details

  • The listing states a 2-year warranty and invites buyers to consult for support.
Product details in Markdown