Ranking by math. No editorial picks.

The ranking

We rank by €/Wh — price in euros divided by usable capacity in watt-hours. For each model, we use the cheapest in-stock offer across the marketplaces we cover.

Why €/Wh and not €/mAh

mAh comparisons only make sense within a single voltage class. A 10 Ah 12 V battery and a 10 Ah 24 V battery store very different amounts of energy. Wh is voltage- normalised energy. It lets us compare across formats fairly.

Marketplaces we cover

Amazon.de, eBay.de, and AliExpress in V0. We add more as we grow.

Data freshness

Prices are checked manually on a weekly cadence. Every offer carries the date we last verified it. Markets move; the site updates as we refresh the catalog.

What we don’t do

• Paid placements
• “Editor’s picks” disguised as rankings
• Including out-of-stock offers in the best-price calculation

Browse the current power station rankings.