How we rank results
BatteryTrackHub compares the prices of plug-in solar batteries, power stations, expansion batteries, plug-in solar kits with battery and solar generators across several shops. We do not sell anything ourselves. EU rules (Directive (EU) 2019/2161, the Omnibus Directive) require websites that let you search for products from different sellers to explain, in plain language, the main parameters that decide the order of the results and how much weight each one carries.
Main parameter: price per usable kWh
By default the lists on this site (home page, category, brand and shop pages, and search) are sorted by two criteria in this order: first, products that are in stock, and within those, the lowest price per usable kWh we have found for that product, from lowest to highest. The price per usable kWh is the price divided by the usable capacity the manufacturer states, which is the energy you can actually draw. If the manufacturer does not state it, we use the nominal capacity and mark this next to the price. We use the price per kWh rather than the total price because a small battery is cheap overall but expensive per kWh stored. The price is the one shown to you for your market, including the VAT each shop charges. Delivery does not affect the order: we show it separately. With the selector on each list you can reverse the price order or sort by the total price of the cheapest offer, from lowest or from highest. Products in stock still come first. No other factor changes this order.
Standalone solar panels: price per watt
Solar panels sold on their own have no battery, so in their listing the price per usable kWh is replaced by the price per peak watt: the price divided by the rated power the maker states, adding up every panel in the pack. Nothing else changes: what is in stock comes first and, within that, the lowest price per watt. In listings that mix batteries and panels, such as a brand or a shop, batteries come first, by price per kWh, and panels after them, by price per watt.
Power tool batteries and cells: price per Wh
Power tool batteries and cells are compared by price per watt-hour: the price divided by their nominal energy, which is the nominal voltage times the capacity on their label (18 V and 5.0 Ah make 90 Wh, an 18650 at 3.6 V and 3,500 mAh makes 12.6 Wh), adding up every unit in the pack. "12 V max" packs are 10.8 V nominal and "40 V max" packs are 36 V. The capacity comes from the maker's datasheet for that exact model, never from a number in the title. We only compare genuine batteries, not compatible ones. A kit with a charger is compared by its full price.
Deals and biggest price drops: biggest drop first
The deals page and the "biggest price drops" on the home page are not sorted by price but by how far the price has fallen: from the largest to the smallest percentage drop compared with the last different price we recorded for that product in the last 14 days. Only drops of at least 5 % on products in stock are included. We always compare with our own daily price history, never with a "was" price given by the shop.
What never affects the order
The commission a shop pays us when you buy through our link has no effect at all on where that shop appears. We do not sell placements, and no shop can pay for a better ranking. If that ever changes, we will say so right next to the results and not only on this page.
Affiliate links
Outgoing links to shops are affiliate links: if you buy through them, the shop may pay us a small commission, at no extra cost to you. Every one of these links carries rel="sponsored" so that search engines recognise the paid relationship, and we disclose it here and next to every list of results. It has no effect on the ranking (see above).
Stock and availability
"In stock" reflects what we saw the last time we checked that shop, not a live count. We check prices and stock regularly, and every product page shows the source and how recent its data is.