7/14/2026
Another test reviewThis is a test review for verifying infinite scroll and batch loading of reviews on the product details page. It is very detailed.
— Filip test 2
Most battery packs
are built on hope.
You design it free. We build it safe.
Your e-bike or scooter pack, designed free in WattWorks and built by ESH Electric from verified cells — so it works the first time, not the third.
Every cell individually tested. Every pack engineered.
100% original cells. Zero fake capacities.Perfectly balanced for max lifespanMaximum power when you need it mostEliminate fire risk in your projectsUnbreakable welds for daily use100% original cells. Zero fake capacities.Perfectly balanced for max lifespanMaximum power when you need it mostEliminate fire risk in your projectsUnbreakable welds for daily use100% original cells. Zero fake capacities.Perfectly balanced for max lifespanMaximum power when you need it mostEliminate fire risk in your projectsUnbreakable welds for daily use100% original cells. Zero fake capacities.Perfectly balanced for max lifespanMaximum power when you need it mostEliminate fire risk in your projectsUnbreakable welds for daily use
100% original cells. Zero fake capacities.Perfectly balanced for max lifespanMaximum power when you need it mostEliminate fire risk in your projectsUnbreakable welds for daily use100% original cells. Zero fake capacities.Perfectly balanced for max lifespanMaximum power when you need it mostEliminate fire risk in your projectsUnbreakable welds for daily use100% original cells. Zero fake capacities.Perfectly balanced for max lifespanMaximum power when you need it mostEliminate fire risk in your projectsUnbreakable welds for daily use100% original cells. Zero fake capacities.Perfectly balanced for max lifespanMaximum power when you need it mostEliminate fire risk in your projectsUnbreakable welds for daily use
The €500 mistake
you don't see coming.
Fake specs
Many cells on secondary markets don't match listed capacity. You find out after you've already spot-welded 120 cells.
IR mismatch
One cell with 3× the internal resistance creates a hot spot. Hot spots cause thermal runaway.
Wrong BMS
A 30A BMS on a 40A draw isn't a limitation - it's a liability. You find out mid-ride, 15km from home.
No validation
You don't know if your pack overheats at 80% load until it does. By then, it's too late to redesign.
BEFORE
Spreadsheets. Forum posts. And a prayer that the BMS spec matches reality.
AFTER
A 3D-simulated, thermally validated pack design - built on verified cell data. Exported as production-ready CAD files.
THE BRIDGE
WattWorks is the only browser-based platform that lets you design, simulate, and validate battery packs before you invest.
What our customers say
4.2(6 reviews)
7/14/2026
garbage stvarne go biva ova adfojnasdfoksjandfoakdfnasodfkansdfl
— so e ova
7/14/2026
garbage stvarne go biva ova adfojnasdfoksjandfoakdfnasodfkansdfl
— so e ova
7/14/2026
Baterija napravenOva e votr test
— Test filip 2
7/14/2026
Test reviewTest revies za baterija
— Filip test
5/10/2026
bravo deckifnsadofnadsfoansdfoaksdnfasdfadsf adsf asdf asdf sdf sadf asdf fnsadofnadsfoansdfoaksdnfasdfadsf adsf asdf asdf sdf sadf asdf fnsadofnadsfoansdfoaksdnfasdfadsf adsf asdf asdf sdf sadf asdf fnsadofnadsfoansdfoaksdnfasdfadsf adsf asdf asdf sdf sadf asdf fnsadofnadsfoansdfoaksdnfasdfadsf adsf asdf asdf sdf sadf asdf
— wow top noch
Power
Architected
See your battery pack in 3D before you spend a single cent. Pick cells, define the configuration, and WattWorks shows you if it will work.
Pick cells → get a 3D pack
Choose a cell type and configuration, and WattWorks auto-generates a precise 3D model with real dimensions.
Test before you build
Simulate voltage, current, and losses on your design before buying cells - so you know it will work.
Export for manufacturing
Export STL and DXF files directly from your design - ready for fabrication, quotes, or documentation.
Every pack.
Hand-engineered.
We don't mass-produce. We engineer. Every pack is designed for a specific project, with cells that are individually tested and IR-matched.
Engineering-first
Approach
Per-cell
Testing
3D validated
Design
Don't have time to build?
Leave the engineering to us.
If you want a professional pack without buying welding and testing equipment, we handle the entire process. From design to delivery.
- Cell selection based on your application
- Thermal and current load calculations
- Industrial CNC spot welding
- Load testing before delivery
Ready for a reliable pack?
Tell us the dimensions and required power. We'll send you a quote with a 3D model of the pack.
Get a QuoteFrequently Asked Questions
WattWorks is a free online platform for 3D battery pack design. It lets you configure geometry, simulate electrical performance, and export CAD files for manufacturing.
We carry 18650, 21700, and LiFePO4 cells from verified manufacturers: Samsung SDI, Molicel, EVE, and LG. Each cell is individually tested for capacity and internal resistance.
Choose a cell type, define the configuration (series/parallel), and WattWorks auto-generates a 3D model with precise dimensions, simulates the electrical network, and gives you real estimates for voltage, current, and losses.
Yes, we ship to EU countries and the wider region. Battery cells are packaged according to UN38.3 standards for safe transport.
21700 cells are larger (21mm × 70mm vs 18mm × 65mm) and typically offer 30-50% more capacity with similar chemistry. They're used in newer EV applications and energy storage systems.
Yes. Submit a quote request with your project details. We'll design the pack in WattWorks, select cells, and build, test, and deliver it.
Original cells. No surprises. No fake capacities. No recycled cells. Only authentic brands ready for building.
Stop guessing.
Start engineering.
Whether you're designing your first pack or your fifth, WattWorks gives you the confidence to build right.