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LiTime 12V 100Ah LiFePO4 Battery vs Duracell Ultra Group 27M AGM Marine Battery

Buy the LiTime if you want deep-cycle capacity for solar, off-grid or RV house power. Its LiFePO4 cells deliver the full 100Ah usable, weigh about 24 lbs and last thousands of cycles. The Duracell Ultra is a lead-acid AGM with 620 cold-cranking amps, so it can also start an engine and is the safer pick for a boat or RV that needs both cranking and house power. The LiTime is not rated for engine start-up, and the Duracell is heavier and gives you less usable capacity for the same nominal 100Ah.

  • Choose the LiTime 12V 100Ah if you need deep-cycle storage for solar, off-grid or RV house loads and never plan to crank an engine with it.
  • Choose the Duracell Ultra Group 27M if you need one battery that both starts a marine or RV engine and runs house loads.

Prices

  • LiTime 12V 100Ah LiFePO4 Battery: $302.39 at LiTime (last seen Nov 9)
  • Duracell Ultra Group 27M AGM Marine Battery: $299.99 at Batteries Plus (last seen Nov 9)
  • Difference: the Duracell Ultra Group 27M AGM Marine Battery is $2.40 cheaper than the LiTime 12V 100Ah LiFePO4 Battery at the latest prices (Nov 9)
LiTime
LiTime 12V 100Ah LiFePO4 Lithium Deep Cycle Battery

LiTime 12V 100Ah LiFePO4 Battery

LiTime 12V 100Ah LiFePO4 Lithium Deep Cycle Battery

4.9(538 ratings)
$302.39at LiTimeChecked Nov 9
See all prices and details
Visit LiTime
Pros
  • Full 100Ah usable capacity
  • Light at about 24 lbs
  • 4000+ cycles and 10+ year expected life
  • Built-in BMS and IP65 rating
  • Scales to 4S4P for larger banks
Cons
  • Not for engine start-up
  • Needs a lithium-compatible charger
  • Cold-weather charging needs the self-heating version
  • Higher upfront cost than lead-acid
Duracell
Duracell Ultra BCI Group 27M 12V 100AH 620CCA AGM Deep Cycle Marine RV Battery

Duracell Ultra Group 27M AGM Marine Battery

Duracell Ultra BCI Group 27M 12V 100AH 620CCA AGM Deep Cycle Marine RV Battery

$299.99at Batteries PlusChecked Nov 9
See all prices and details
Visit Batteries Plus

Store links may earn us a commission. Price via Klarna.

Pros
  • 620 CCA starts engines
  • Works with ordinary lead-acid chargers
  • Sealed AGM needs no water topping
  • Widely available Duracell brand
  • Handles both cranking and house duty
Cons
  • Heavy for its capacity
  • Shorter deep-cycle life
  • Only about half the rated capacity is usable
  • No BMS protection

What separates them

LiTime 12V 100Ah LiFePO4 BatteryDuracell Ultra Group 27M AGM Marine Battery
ChemistryLiFePO4 lithiumLead-acid AGM
Engine crankingNot rated for start-up620 CCA, starts engines
Usable capacityAbout 100Ah usable at 100% depth of dischargeRoughly half its rated capacity usable in deep-cycle use
Cycle life4000+ cycles at 100% depth of dischargeHundreds of cycles in deep-cycle service
WeightAbout 24 lbsNoticeably heavier lead-acid build
Battery managementBuilt-in BMS with overcharge and over-discharge protectionNo electronics; relies on the charger
Water resistanceIP65 ratedSealed AGM, not rated IP65
ExpansionSeries and parallel up to 4S4P, about 20.48kWhParallel only, same voltage

Price history

  • LiTime 12V 100Ah LiFePO4 Battery: lowest $302.39 on Oct 31 at Amazon.
  • Duracell Ultra Group 27M AGM Marine Battery: lowest $299.99 on Nov 10 at Batteries Plus.

Prices at every store

LiTime 12V 100Ah LiFePO4 Battery

  • LiTimeNew

    In stockReturn policy

    $302.39Checked Nov 9
    Visit LiTime
  • AmazonNew

    Availability unknown

    As an Amazon Associate, Deal.ai earns from qualifying purchases.

    $302.39Checked Oct 31
    Visit Amazon
  • eBayNew

    Availability unknown

    $319.99Checked Oct 31
    Visit eBay

Also available at

  • Li TimeCheck price at Li Time
All 3 stores and price history →

Duracell Ultra Group 27M AGM Marine Battery

  • Batteries PlusNew

    In stock

    $299.99Checked Nov 9
    Visit Batteries Plus

Store links may earn us a commission. Price via Klarna.

Prices and history →

Specs compared

SpecLiTime 12V 100Ah LiFePO4 BatteryDuracell Ultra Group 27M AGM Marine Battery
Battery Technology—Lead-Acid
Type—Batteries
Batteries—Vehicle Battery
Input Voltage (V)—12.0

What reviewers say

LiTime 12V 100Ah LiFePO4 Battery

  • 4.9 / 5538 ratings

Rated 4.9 out of 5 across 538 ratings, buyers mostly report the battery delivers its rated capacity and holds up in RV and trolling motor use. Complaints are few and tend to center on cold-weather charging and the lack of app monitoring on this base model.

What people mention
  • CapacityPraisedOwners say it delivers close to its rated 100Ah in real use.
  • WeightPraisedBuyers highlight the roughly 24 lb weight against much heavier lead-acid banks.
  • BuildPraisedReviewers describe solid construction and a sealed, waterproof case.
  • Cold chargingCriticisedSome note it cannot be charged below freezing unless they buy the self-heating version.

Questions and answers

Which is better for a trolling motor?
The LiTime. It gives the full 100Ah, weighs much less and lasts thousands of cycles. It suits trolling motors in the 30 to 70 lb thrust range.
Can the LiTime start my boat engine?
No. LiTime states this battery is for energy storage, not start-up. Use the Duracell Ultra if you need cranking amps.
Which lasts longer?
The LiTime by a wide margin. It is rated for 4000+ cycles at full depth of discharge, while the AGM gives hundreds of deep cycles.
Do I need a special charger for the LiTime?
Yes. Use a charger with a lithium LiFePO4 profile. The Duracell AGM works with standard lead-acid chargers.
Is the Duracell worth stepping up to?
Only if you need engine cranking or want a drop-in replacement for an existing lead-acid setup. For pure storage, the LiTime is the stronger choice.

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