The cell format is a decision, not an identity
Most battery suppliers have one format and an argument for why it suits everything. We keep three on the table and choose per application, because the machine's duty cycle — not our tooling — should decide what goes inside the case.
Worked example
A 48V 105Ah golf cart pack
Built from prismatic cells, it takes 15 in series. Built from large-cylindrical cells, it takes roughly 105, in a 15-series 7-parallel arrangement.
The cylindrical version carries seven times the weld count, about 15% more mass and over 50% more volume, and it needs 105 cells matched for capacity and impedance instead of 15. What it buys in return is fast-charge headroom that a cart plugged in overnight will never draw on.
Put that same cell in a forklift running three shifts with break-time charging and the trade reverses completely. Same chemistry, opposite answer.
| 48V 105Ah | Prismatic | Cylindrical |
|---|---|---|
| Cells | 15 | ≈ 105 |
| Weld points | ≈ 30 | 210+ |
| Pack volume | ≈ 0.9 ft³ | ≈ 1.4 ft³ |
| Pack weight | ≈ 82 lbs | ≈ 95 lbs |
| Space used | ≈ 92% | ≈ 65% |
Representative figures for a 15S1P prismatic build against a 15S7P large-cylindrical build at equivalent energy. Volume 0.9 ft³ (25 L) against 1.4 ft³ (39 L); weight 82 lbs (37 kg) against 95 lbs (43 kg).
Three formats, three jobs
Prismatic
The default for most of what we build
A rectangular hard-case cell stacks with almost no wasted volume. For a 48V 105Ah pack that means 15 cells and around 30 weld points: fewer parts to match, fewer joints to fail, and a lighter pack than any cylindrical equivalent.
- Space used
- ≈ 92%
- Cells @ 48V 105Ah
- 15 cells
- Rate capability
- Moderate
Best for: Golf carts, energy storage, RV house banks, forklift traction
Large-cylindrical
When the duty cycle is genuinely high-rate
Round cells cannot tile without gaps, so the same energy takes more volume and more mass. What you buy with that penalty is thermal headroom and current capability — worth it for a truck charging on breaks, wasted on a cart charging overnight.
- Space used
- ≈ 65%
- Cells @ 48V 105Ah
- ≈ 105 cells
- Rate capability
- High
Best for: Multi-shift forklifts, opportunity charging, high-vibration duty
Long-cell
Where the pack is the structure
An elongated prismatic cell spanning the full pack width removes a layer of module hardware entirely. Best space efficiency of the three, and the format of choice when the enclosure is shallow or the pack carries structural load.
- Space used
- ≈ 95%
- Cells @ 48V 105Ah
- 8 – 12 cells
- Rate capability
- Moderate
Best for: Cell-to-pack integration, shallow enclosures, chassis-integrated packs
The BMS does eight jobs at once
Protection is enforced in hardware and in software, with per-cell voltage and temperature monitoring behind it. Dynamic balancing keeps the pack matched as it ages, which is what actually determines whether you see the rated cycle life.
- Over-charge
- Over-discharge
- Over-voltage
- Over-current
- Overload
- Short circuit
- Over-temperature
- Over-power
Bluetooth telemetry is standard on light-duty packs. CAN 2.0B and RS485 are available where the equipment controller needs state of charge, cell temperatures and fault flags on the vehicle bus.
3,000+ cycles
Grade-A lithium iron phosphate (LFP) cells rated beyond 3,000 charge cycles with 80% capacity remaining. Every cell in a pack comes from the same production batch and is matched on capacity and internal resistance before assembly.
−4 °F to 149 °F
Rated across the full operating window (−20 °C to 65 °C). Where charging below freezing is an actual operating requirement rather than a spec-sheet line, we fit self-heating film that brings the pack into range before it accepts current.
Certified for transport
UN38.3 certified for air and sea freight. Cells are manufactured in facilities holding ISO 9001, ISO 14001 and ISO 45001. Application-specific certification is available on request for particular programs.
Not sure which format your application needs?
Describe the duty cycle — how long it runs, how hard it pulls, when it charges and how cold it gets — and we will tell you which way the trade-off falls. That includes the cases where the answer is that your current chemistry is fine.
Talk to engineering