How we research
What our guides are based on, what they are not based on, and how to tell us when something is wrong.
We do not test products
BatteryPlaces does not run hands-on product tests. When a page compares products, it uses the specifications each brand publishes and says so. Charging times, cycle counts and lifespans are the brand’s own claims, and we label them that way.
Where facts come from
- Specs and prices: the brand’s own product page, or the retailer page we link. Each price table shows the date we checked it.
- “Compare-at” prices are the brand’s own crossed-out price. We do not treat them as verified price history. Our guide on how to spot a real deal explains why.
- Rules, tax credits and incentives: government and program sources such as the IRS, state agencies and utilities, linked on each page.
- Technical background: manufacturers’ manuals and spec sheets, and public sources such as university extension guides.
Every guide ends with a list of sources so you can check them yourself.
Calculators show their math
Our calculators, like the runtime calculator and the power station selector, show the formula and every assumption, such as the 85% efficiency we assume for inverter losses. You can change the inputs. They run in your browser and do not send what you type anywhere.
Dates and updates
Prices change often, so deal pages say when each price was checked. When we change a page’s content, its “last modified” date in our sitemap changes too.
Money
Some links may become affiliate links in the future. Commissions do not decide what we write about or what we say. See the affiliate disclosure. None of the links on this page are affiliate links yet.
Found a mistake?
Email [email protected] with the page and what looks wrong. We check it against the source and fix the page if we got it wrong.