How we research and compare
We use maker documents and public authorities for changing claims, then label what that evidence can actually prove.
Source hierarchy
- Official datasheet, manual, certification or government source.
- Maker product page or dated release.
- Independent technical research for context.
- Retail listings only as evidence of a listing—not proof of stock or performance.
Tracker rules
“On sale” needs primary evidence of UK shipment or a live authorised route. “Check current stock” means the route exists but inventory is uncertain. Testing, pre-orders and future delivery remain unavailable or announced.
Comparisons
We have not tested these products. We compare published specifications and state whether a number describes a cell, module or complete system. We do not turn a maker claim into a chemistry-wide fact.