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AE LV 40 LiFePO4 — coming soon

AE LV 40 – 40ah LiFePO4

40ah LiFePO4 for stock-voltage systems. 12.8 to 14.6V window — no boosted alternator required.

⚡ Coming soon — expected End of 2026. Not available to order yet.

Size my system

Give us your charging voltage and load and we will tell you whether this is the right pack for you when it arrives — or point you at something available now.

Need help? Installation guideCharging & safetyWarrantyIs this the right pack?

AECharger
You’ll need a way to charge it AECharger · $70.00 Programmable CV/CC bench supply. Set the voltage and current to your pack’s charging window and top it off between sessions.
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SKU: LV40
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Description

⚡ COMING SOON — end of 2026

40ah of LiFePO4 for daily-driven systems on a factory charging voltage.

Charging

  • Window 12.8 – 14.6V · Hard limit 14.6V
  • No high-output alternator required

Discharge

  • Continuous 1,400A — 2 parallel strings, load-tested
  • Configuration 4S2P · 8 cells

True Amplifier Power Ratings*

14.4V Charging (Recommended — stock alternator)

  • 13,400W – Standalone (Constant)
  • 14,400W – With Stock Alt
  • 15,400W – With 200A Alt
  • 16,400W – With 300A Alt

13.8V Charging

  • 11,400W – Standalone (Constant)
  • 12,400W – With Stock Alt
  • 13,400W – With 200A Alt
  • 14,400W – With 300A Alt

Cell Power Ratings**

14.4V Charging (Recommended)

  • 16,800W – Standalone (Constant)
  • 18,100W – With Stock Alt
  • 19,300W – With 200A Alt
  • 20,600W – With 300A Alt

* True Amplifier Rating is the expected power support at 80% amplifier efficiency — what your system actually sees.
** Cell Power Rating is the raw power pulled from the battery before amplifier efficiency is applied. Projected from load testing of this cell configuration at 14.4V; confirmed on the production pack.

Specifications

Battery & capacity

Chemistry
LiFePO4
Capacity
40Ah
Output
13,400W constant at 14.4V (projected)

Discharge

Continuous
1,400A
Maximum
—
Rate
4S2P, load-tested
Discharge cutoff
—

Charging

Charging window
12.8V – 14.6V
Hard limit
14.6V — never above
Alternator
Stock alternator

Physical & ownership

Balancing
Active balancer, no BMS cutoff
Warranty
1-year limited

Every pack arrives at roughly 30% state of charge. Charge it to your system voltage on the bench before installing — see the installation guide.

Running more than one pack?

Charging windows & pairing.

Every pack has a voltage window it lives in. This chart is zoomed to the AE LV LiFePO4 so you can see at a glance what it shares a bank with — and where to set your charging system when it does.

Charging windows · zoomed to this packboth packs happy outside this pack’s window
12.5V13V13.5V14V14.5V15V
AE LV LiFePO4this pack
floor 12.8Vlimit 14.6V
KILO sodium13.8V – 14.6V together
13.8V – 16V
HP40/80 limit
AE LTOnever mixed · lithium + lithium
THE DON NMCnever mixed · lithium + lithium
  • Any other AE LVPairs freely — same chemistry, same window.
  • KILO sodiumPairs inside 13.8V – 14.6V · set 14.6V. Below 13.8V the KILO sodium is undercharged; above the KILO’s limit the KILO suffers.
  • AE LTONever on one bank — lithium + lithium is unsafe.
  • THE DON NMCNever on one bank — lithium + lithium is unsafe.
How pairing works

Read the chart. Red is where this pack is outside its own window. Another chemistry can share the bank only where its bar crosses the clear area — the yellow band — and the charging system must sit inside it. Set it at the white marker, the top of the band: at the bottom of the band the pack with the higher floor is undercharged and never reaches rated output; above the top the pack with the lower ceiling is past its hard limit.

Sodium ion is the only chemistry that mixes. Lithium chemistries (LTO, LiFePO4, NMC) are never banked together — that is unsafe, and we do not support it.

On any bank: matched cable lengths so the packs share evenly, and bring every pack to a similar state of charge before connecting.

Before you buy

Worth reading first.

Sizing

How to size a battery bank

Amp-hours tell you how long, C-rate tells you how hard. The full calculation worked with real numbers.

Chemistry

Sodium vs LTO vs LiFePO4

Your charging voltage decides your chemistry. An honest comparison, including when the cheaper one wins.

Diagnostics

Why voltage drops on the hit

Five checks before you buy another battery. Most of the time the pack is innocent.