35 kWh Lithium-Ion Battery Packs

Configuration Explorer

Each point is one validated MonoLith configuration. Toggle between rated and peak power. Click a point to open it in PackForge.

What Limits Each Pack

How many configurations are limited by each factor during full-capacity and peak discharge.

Fit Check

Enter your maximum envelope dimensions to see which configurations fit.

Load and Runtime Estimator

Pick a configuration and enter your average load to estimate runtime and cell thermal behavior.

Cell and Collector Test Data

These charts come from P50B cell tests, collector plate tests, and a drive-cycle simulation of a reference pack. They show the cell and interconnect behavior shared by every configuration on this page; they are not 25 kWh pack test results.

Inside the Pack

The Cell at the Core

Every MonoLith pack is built around a single cell chemistry we've validated across hundreds of test hours. The pack engineering — collector plates, thermal architecture, wire bonding — is where EVolve adds value. The cell is the foundation we chose carefully, not the product we sell.

The cell inside every MonoLith pack. A 21700-format power cell chosen for its balance of energy density, discharge capability, and cycle life.

Format

21700 cylindrical

3.6 V nominal

Capacity

5.0 Ah

18 Wh per cell

Energy density

265 Wh/kg

714 Wh/l

Max discharge

60 A

cut off at 80 °C

DC impedance

12.8 mΩ

typical, new cell

Fast charge

5C

25 A charge rate

NoteSpecifications are manufacturer-published reference data with no performance guarantee. Pack-level behaviour differs from single-cell data — see the thermal charts below.

Why This Cell

Silicon-carbon composite anode

The anode formulation is what doubled cycle life from 700 to 1,400 cycles at the cell level. Silicon-carbon composites accommodate more lithium per unit volume than conventional graphite, but managing the volume expansion during cycling is the engineering challenge — and the reason the cycle life gain is real.

High-nickel layered oxide cathode

Higher nickel content pushes energy density and power delivery. The trade-off is thermal sensitivity at high states of charge, which is exactly what the thermal charts on this page quantify.

Low-temperature electrolyte formulation

The electrolyte is formulated to maintain ionic conductivity at low ambient temperatures, extending the usable charge window below 0 °C.

Cycle Life

1,400 cycles

At 23 °C, cell level, with +1C charge and −100 W discharge. A packed module runs hotter, so real-world cycle life is lower. We model pack-level degradation against your duty cycle and cooling design — the number above is a best-case anchor, not a field prediction.

Peak Power (10 s)

397 W

25 °C

288 W

50% SOC

238 W

−10 °C

Per cell, 10-second pulse. Pack power scales with cell count. These are manufacturer reference figures — actual sustained output depends on thermal management, which is what the next section explores.

This cell is used in hyper EVs, racing programs, eVTOL, and heavy-lift drone applications. Molicel cells power the McMurtry Spéirling, which holds the Goodwood Festival of Speed hill climb record — a legitimate halo for the cell we build around, and a data point on what the chemistry is capable of in the right hands.

So how does this cell actually behave under load? That's the next section.

Full Configuration Table

Multi-pack configurations combine identical MonoLith packs; see PackForge for wiring and interconnect details.

Frequently Asked Questions