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THE DON 55 NMC — coming soon

THE DON 55 – 55ah NMC

$650.00

55ah NMC. 24C constant / 40C pulse discharge. The highest charging ceiling we make — 14.8 to 16.6V, built for systems running serious voltage.

⚡ 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?

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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: DON55
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Description

⚡ COMING SOON — end of 2026

THE DON is our NMC line, in development now. It has the highest charging ceiling of anything we build and it is aimed at systems running 15.5V and above. Register interest and we will tell you the moment the first run is scheduled.

Chemistry

NMC (nickel manganese cobalt). Higher voltage ceiling than sodium ion or LTO, with a nominal of 15.3V in a 4S configuration.

Charging

  • Charging window 14.8 – 16.6V
  • Hard limit 16.6V — never above
  • Nominal 15.3V

Discharge

  • Constant 24C
  • Pulse 40C at 50% SoC to 2.7V per cell

Figures are from cell-level testing and are subject to confirmation on the production pack.

True Amplifier Power Ratings*

15.3V Charging (Recommended nominal)

  • 20,200W – Standalone (Burst <5s)
  • 15,800W – Standalone (Burst <15s)
  • 12,900W – Standalone (Constant)
  • 15,100W – With 200A Alt
  • 16,100W – With 300A Alt

14.8V Charging (Minimum)

  • 11,000W – Standalone (Constant)
  • 13,200W – With 200A Alt
  • 14,200W – With 300A Alt

Cell Power Ratings**

15.3V Charging (Recommended nominal)

  • 25,300W – Standalone (Burst <5s)
  • 19,700W – Standalone (Burst <15s)
  • 16,100W – Standalone (Constant)
  • 18,600W – With 200A Alt
  • 19,600W – 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 cell-level testing (1,320A continuous at 24C, 2,200A pulse at 40C) and confirmed on the production pack.

Specifications

Battery & capacity

Chemistry
NMC
Capacity
55Ah
Output
12,900W constant at 15.3V (projected)

Discharge

Continuous
1,320A
Maximum
2,200A pulse
Rate
24C constant, 40C pulse
Discharge cutoff
—

Charging

Charging window
14.8V – 16.6V
Hard limit
16.6V — never above
Alternator
200A minimum, high output

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 THE DON NMC 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
14.5V15V15.5V16V16.5V17V
THE DON NMCthis pack
floor 14.8Vlimit 16.6V
KILO sodium14.8V – 16V together
13.8V – 16V
HP40/80 limit
AE LTOnever mixed · lithium + lithium
AE LV LiFePO4never mixed · lithium + lithium
  • Any other THE DONPairs freely — same chemistry, same window.
  • KILO sodiumPairs inside 14.8V – 15.5V · set 15.5V (16V with an HP 200). Below 14.8V THE DON NMC is undercharged; above the KILO’s limit the KILO suffers.
  • AE LTONever on one bank — lithium + lithium is unsafe.
  • AE LV LiFePO4Never 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.

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