EVE LF100LA vs LF105 LiFePO4 Cells: Capacity, Fit and Battery-Build Checks

If you are choosing between the EVE LF100LA and LF105 for a DIY LiFePO4 battery, the five-amp-hour difference is not the main decision. Both are 3.2V-class prismatic cells that can be arranged into 12V-, 24V- or 48V-class banks, but their current AmpBird product listings show different dimensions and different test fields.

The practical answer is:

• choose the LF100LA when its current listing, physical envelope and verified test evidence fit the enclosure and the intended load;
• choose the LF105 when its narrower, taller form and the available discharge evidence fit the build better; and
• do not choose either model from the Ah number alone, and do not mix LF100LA and LF105 cells in one series pack without a qualified design and individual test data.

This is a current listing comparison, not a replacement for the exact manufacturer datasheet, batch report or BMS design. The live AmpBird product pages were checked on September 9, 2026. Product fields, stock, available test documents and accessory packages can change, so confirm the exact model and batch before ordering or assembling a pack.

Quick Answer: Which Cell Should You Choose?

The LF100LA and LF105 are close in nominal energy but not interchangeable by label. The current AmpBird listings identify the LF100LA as a 100Ah-class cell with a page-stated 102Ah calibrated minimum and 326.4Wh per cell. The LF105 listing identifies a 105Ah cell with 336Wh per cell. The nominal energy difference is only about 2.9% when the two page-stated energy values are compared.

That small energy difference can be outweighed by:

1. the available length, width and height in the enclosure;

2. terminal position, busbar layout and service access;

3. the current evidence available for the exact model and test condition;

4. whether all cells come from one model, batch and matching process;

5. the BMS, charger, fuse, conductor and inverter limits; and

6. the documentation you can obtain before the purchase.

The LF100LA is physically wider and shorter in the dimensions shown on its product page. The LF105 is narrower and taller. Neither shape is universally better: the correct choice is the one that passes the actual enclosure, restraint, connection and current-path checks.

What This Article Owns—and What It Does Not

This article owns the narrow comparison between the current AmpBird LF100LA and LF105 cell listings. It explains how to interpret their capacity, nominal energy, physical dimensions, current evidence, temperature fields and purchase checks before a pack is designed.

It does not claim that one model is the universal winner. It does not approve a finished 12V, 24V or 48V battery, guarantee runtime, or replace the documentation for a charger, inverter, motor, BMS or enclosure.

For the broader question of what “Grade A” should mean and which evidence to request from a seller, use How to Choose Grade A LiFePO4 Cells. For the separate question of combining different cell models, brands or ages, see Can You Mix Different LiFePO4 Battery Cells?. Those articles own the broader quality and mixing decisions; this one applies those principles to LF100LA versus LF105.

Current Listing Snapshot: LF100LA vs LF105

The following table records what was visible on the two AmpBird product pages when this comparison was prepared. The wording “listing field” is intentional. A Shopify product page is useful purchase evidence, but it is not automatically the same thing as a signed, model-specific manufacturer datasheet for the batch you will receive.

The LF105 product page currently contains more than one technical-specification block, including different temperature and dimensional values in the lower block. That is a documentation conflict worth resolving, not a detail to hide. Use the exact model, document revision and batch report supplied for the order as the controlling evidence.

The AmpBird LF100LA listing and AmpBird LF105 listing are the two live references for the snapshot above. Check them again at the time of purchase, because price, stock, package quantity, warehouse option and page fields are operational information that can change.

The 5Ah Difference Is Smaller Than It Looks

At the cell level, the page-stated energy difference is:

336Wh − 326.4Wh = 9.6Wh per cell

That is about 2.9% of the LF100LA listing value. In a 4S pack, the arithmetic difference is 38.4Wh; in an 8S pack it is 76.8Wh; in a 16S pack it is 153.6Wh. Those figures can matter at the edge of an energy budget, but they are rarely enough by themselves to justify a model that does not fit or whose current documentation is incomplete.

The practical comparison is therefore “slightly more nominal energy versus a different physical and documentation envelope,” not “105Ah always beats 100Ah.”

Nominal Energy at 4S, 8S and 16S

For transparent planning, multiply the page-stated energy per cell by the series count. The following values assume all cells are the same model and that the configuration is electrically qualified.

Nominal energy is not the same as usable energy. Actual output depends on the battery’s permitted state-of-charge window, voltage cutoff, load current, BMS behavior, cell condition, temperature, inverter efficiency and the reserve you need for the application. If the load is AC, a first-screen runtime estimate should also allow for inverter losses:

Estimated AC runtime ≈ nominal energy × planning fraction × inverter efficiency ÷ AC load

The planning fraction and efficiency must be stated assumptions, not hidden constants. A 12.8V-class bank that appears to contain about 1.3kWh per the table does not promise 1.3kWh at the AC outlet.

Physical Fit: The Dimensions Are Not a Minor Detail

The two listings describe very different proportions:

• LF100LA: 160.0mm long, 50.1mm wide and 118.5mm high in the visible listing field;
• LF105: 130.3mm long, 36.7mm wide and 200.5mm high in the main visible technical block.

Those dimensions are not a simple “small versus large” ranking. They represent different orientations and different packing decisions. A cell that fits the available volume may still fail the real installation because the terminal posts, busbars, cable bend radius, insulation, compression hardware or enclosure lid need clearance.

Before choosing a model, record:

1. the clear length, width and height inside the enclosure;

2. the opening through which each cell must pass;

3. terminal position and the direction of the busbars;

4. clearance from the terminal to the enclosure wall or lid;

5. cable bend radius and strain-relief space;

6. the compression or restraint method required by the pack design;

7. insulation barriers between adjacent cells and between live parts and the case; and

8. access for inspection, torque checks and BMS service.

Do not rotate a prismatic cell or change its compression plan merely to make a drawing fit. Confirm the model’s allowed orientation and mechanical requirements with the manufacturer or supplier documentation. The energy calculation cannot compensate for a mechanically unsafe pack.

Current and BMS Evidence: Do Not Compare Mismatched Fields

The most important documentation difference in this snapshot is not 100Ah versus 105Ah. It is that the product pages expose different current fields.

The LF100LA page shows a standard 0.2C charge/discharge field and a maximum charge current field. The visible block does not provide a like-for-like maximum continuous discharge field. The LF105 page shows standard 0.5C charge/discharge, maximum continuous discharge and a short-duration peak-discharge field.

That does not prove that the LF105 is automatically better for a high-current load. It only means that more discharge information is currently visible on that listing. You cannot copy the LF105 105A or 315A values to the LF100LA, and you cannot treat the LF100LA maximum charge value as a discharge rating.

For a first battery-side current screen, use:

Battery current ≈ load power ÷ battery voltage

If a 12.8V-class system delivers 1,000W to an inverter and the illustrative inverter efficiency is 90%, the battery-side estimate is:

1,000W ÷ 0.90 ÷ 12.8V ≈ 86.8A

That is an arithmetic example, not a product rating. The final design must check the lowest valid limit in the complete current path:

• cell continuous and short-duration discharge limit;
• BMS continuous and peak limit and its time window;
• fuse or breaker interrupt and operating rating;
• cable ampacity, length and voltage drop;
• busbar, terminal and connector limit;
• inverter startup or motor surge; and
• temperature and enclosure heat dissipation.

The BMS is not a substitute for cell data. A 200A BMS does not make a 100A-rated cell bank a 200A source, and a cell rating does not override a lower fuse, cable, terminal or inverter limit.

For the wider current-path method, read the 48V LiFePO4 wiring, fuse and cable-sizing guide. Its example values belong to the systems it discusses; use its method, not a copied number, when evaluating a different 4S, 8S or 16S pack.

Cycle-Life Claims Need Their Test Conditions

The live listings show different cycle-life numbers: the LF100LA page states at least 5,000 cycles under a stated 25°C, 0.5C/0.5C and 80% DoD condition, while the main LF105 block states at least 4,000 cycles at 80% DoD and 0.5C/0.5C.

It would be misleading to conclude that LF100LA will always outlast LF105. A cycle-life claim is meaningful only together with its:

• charge and discharge current;
• temperature;
• depth-of-discharge window;
• end-of-life capacity criterion;
• voltage limits;
• rest or dwell time;
• cell sample and production batch; and
• test laboratory or report reference.

The official EVE page confirms that EVE presents LF105-based standard module solutions such as LF105-2P8S, but it is not an exact datasheet for the two AmpBird product listings in this comparison. Use the EVE LF105 official product context as background on the model family, then request the exact document revision and batch evidence for the cells you intend to buy.

Should You Mix LF100LA and LF105 in One Battery?

As a default design rule, no. Do not mix LF100LA and LF105 cells in the same series string merely because both are 3.2V-class cells and their capacity labels are close.

The two models have different listed dimensions, different current fields, different page-stated standard test rates and different cycle-life claims. Even if a set of cells appears to charge to the same voltage, the cells can differ in actual capacity, internal resistance, voltage curve, temperature behavior, terminal geometry and state of health.

A series pack is limited by its weakest cell. During charge, the cell with the lower effective capacity or different voltage response can reach the upper boundary first. During discharge, a cell with greater resistance or lower state of health can reach the lower boundary first. A smart BMS can observe and protect the string; it cannot make mismatched cells behave as one matched set.

If a repair or unusual engineering project requires different models, treat it as a qualified design problem. Obtain written supplier or manufacturer guidance, test each cell individually, confirm the current and voltage curves, define the mechanical compression and busbar plan, and document why the combination is acceptable. For a new DIY pack, the safer purchasing rule is one model, one chemistry, one series count and one matching process.

12V, 24V or 48V: Choose the Architecture First

Both products can be discussed in 4S, 8S and 16S terms, but the nominal series count does not itself approve a system. The BMS, charger, inverter, protection and enclosure all need to be designed for the selected voltage class.

The broader 12V and 24V LiFePO4 system guide explains how system voltage, capacity and application affect the architecture. Use it for the system-level question; use this article for the LF100LA-versus-LF105 cell selection screen.

Which Model Fits Which Project?

The following matrix is a decision aid, not a product approval.

If a project has a tight physical envelope and the product page dimensions are close to the available space, ask for a current dimensional drawing. A few millimeters of terminal projection or a changed batch fixture can matter more than the nominal 9.6Wh-per-cell energy difference.

Purchase Evidence Checklist

Before placing an order for either model, ask for a written confirmation that names the exact cell and not only the capacity class.

Model and batch identity

• EVE model name: LF100LA or LF105;
• nominal capacity and the capacity basis used in the quote;
• production or batch identifier and QR-code traceability where available;
• current manufacturer document revision; and
• whether the cells are new, tested, matched and from one batch.

Electrical evidence

• measured capacity and the test current;
• open-circuit voltage or delivered voltage consistency;
• internal-resistance method and measured spread;
• permitted charge current and discharge current;
• short-duration peak current and time window, if applicable;
• charge and discharge cutoff boundaries; and
• temperature limits for the intended environment.

Mechanical and pack evidence

• dimensional drawing including terminal projection;
• terminal and busbar hardware;
• enclosure or compression requirements;
• insulation and cell-spacing plan;
• BMS model and series count;
• charger and inverter compatibility; and
• fuse, disconnect, conductor and service-access plan.

For a large or unusual project, send the load profile, enclosure dimensions and system voltage to AmpBird before buying. The AmpBird LiFePO4 cell collection shows the current cell range, while the DIY battery kits collection is a better starting point when you need an enclosure, BMS and assembly hardware rather than loose cells only. For a model, batch or configuration question, use AmpBird contact support and keep the written answer with the order record.

Common Mistakes When Comparing LF100LA and LF105

Mistake 1: Treating 100Ah and 105Ah as finished battery capacity

These are single-cell labels. The final pack voltage, usable energy, current and runtime depend on series count, parallel count, limits and load profile.

Mistake 2: Copying LF105 discharge current to LF100LA

The LF105 page’s discharge fields do not become LF100LA specifications. Request the LF100LA discharge evidence separately.

Mistake 3: Comparing 5,000 cycles and 4,000 cycles without test conditions

Cycle-life numbers need current, temperature, DoD and end-of-life criteria. A larger number with a different test boundary is not automatically the better real-world choice.

Mistake 4: Designing around the cell body but not the terminal

Terminals, busbars, nuts, insulation, cable bend radius and the enclosure lid all consume space.

Mistake 5: Mixing models to reach a desired Ah value

Use one model and a qualified matching set for a new series bank. Do not use a BMS as a substitute for matching.

Mistake 6: Assuming a smart BMS approves the pack

A BMS protects within its configured limits. It does not validate cell chemistry, mechanical restraint, conductor ampacity, charger profile or inverter surge.

Mistake 7: Reading nominal energy as usable AC energy

Apply the permitted operating window and conversion losses, and keep an application reserve.

Mistake 8: Treating an online product page as a fixed datasheet

Page fields, accessory bundles and warehouse options can change. Save the exact quote and request the current evidence before ordering.

Mistake 9: Ignoring temperature

Cold charging, heat inside an enclosure and marine or outdoor exposure can change the safe operating boundary. Check the model-specific temperature evidence.

Mistake 10: Choosing a 48V architecture from the product label alone

The inverter, BMS, charger, pre-charge, isolation and protection must all support the complete 16S system.

Final Decision Rule

Choose LF100LA when its current model and batch evidence, physical envelope and current path fit the project. Choose LF105 when its physical proportions and verified discharge documentation better fit the project. If the two options are both physically suitable, let the quality of the model-specific evidence and the matching process decide—not the isolated 5Ah label.

Do not finalize the choice until you can answer all of these questions:

1. Which exact model and batch am I buying?

2. What are the dimensions including terminals and required spacing?

3. What are the tested capacity, internal resistance and matching results?

4. What are the charge and discharge limits under the intended temperature conditions?

5. What 4S, 8S or 16S BMS and charger will control the bank?

6. What fuse, cable, busbar, disconnect and inverter or motor limits control the current path?

7. What is the usable-energy target after the chosen reserve and conversion losses?

8. What document will I use to resolve any conflict between product-page fields?

That checklist protects the customer from an expensive category error: buying a cell because its label looks attractive, then discovering that the cell does not fit, the current evidence is incomplete or the pack cannot be safely integrated.

Frequently Asked Questions

Is the EVE LF105 always better than the LF100LA because it is 105Ah?

No. The current listing energy difference is small, while the physical proportions and exposed current fields differ. A model that fits the enclosure and has complete, verifiable evidence is the better choice for that project.

What is the nominal energy of one LF100LA cell?

The current AmpBird LF100LA listing states 326.4Wh per cell and describes a calibrated 102Ah minimum at 3.2V. Treat this as listing-level nominal energy, not guaranteed usable pack energy.

What is the nominal energy of one LF105 cell?

The current AmpBird LF105 listing states 336Wh per cell at 3.2V and 105Ah. Actual pack output still depends on the operating window, current, temperature, BMS and conversion losses.

Can I build a 12V battery with either model?

Both can be discussed as a 4S, 12V-class arrangement, but four cells alone are not a finished battery. The pack needs a qualified 4S BMS, charger, protection, insulation, mechanical restraint and a tested assembly plan.

Can I build a 24V or 48V battery with either model?

An 8S arrangement is commonly described as 24V-class and a 16S arrangement as 48V-class. Confirm the exact BMS, charger, inverter, protection and insulation requirements for the completed system before assembly.

Can I mix LF100LA and LF105 cells in one series pack?

Do not do so by default. Use one model, one chemistry, one series count and a qualified matching set. A mixed-model repair requires individual test data and competent engineering approval.

Does the LF105 105A discharge field apply to the LF100LA?

No. The LF105 listing’s discharge field is model-specific. The visible LF100LA specification block does not provide the same like-for-like maximum continuous discharge field, so request that evidence before a high-current design.

Can I use the LF100LA maximum charge current as its discharge current?

No. Charge and discharge limits are different specifications and may be controlled by different temperature, voltage and test conditions.

Why do the LF105 dimensions appear more than once on the page?

The current page contains more than one technical block with slightly different dimensional and temperature fields. Treat that as a documentation conflict and ask for the current model-specific drawing or datasheet revision before designing the enclosure.

Does a 5,000-cycle claim mean LF100LA will last longer than LF105?

Not necessarily. The cycle claims have to be compared under the same current, temperature, depth of discharge, cutoff and end-of-life criteria. Without matching conditions, the numbers are not a fair durability ranking.

Do AmpBird cells include everything needed to make a battery?

Loose cells are only one part of a battery system. Depending on the product and order, busbars or accessories may be offered, but the final build still needs an appropriate BMS, insulation, restraint, protection, enclosure, wiring and commissioning checks. Confirm the current package contents before ordering.

What should I send when asking AmpBird to check a cell choice?

Send the target system voltage, series and parallel plan, maximum continuous and peak load, daily energy target, enclosure dimensions, charger and inverter model, operating temperature and the current model or batch you are considering. That information makes a technical answer more useful than sending only “100Ah or 105Ah?”

Technical References

• AmpBird LF100LA product listing — current seller listing fields used for the LF100LA snapshot.
• AmpBird LF105 product listing — current seller listing fields used for the LF105 snapshot; the duplicate technical blocks are why exact document confirmation is recommended.
• EVE official LF105 product context — general manufacturer context for LF105-based prismatic LFP module solutions, not a substitute for the exact cell datasheet or batch report.
• AmpBird Grade A LiFePO4 cell guide — broader purchase-evidence guidance.

The commercial next step is deliberately secondary: once the model, batch, fit, current path and documentation pass the review, compare the live AmpBird listing or contact support for a configuration-specific answer. A professional battery purchase starts with evidence, not with the larger number on a product card.