Our Methodology
How We Pick: compatibility first, no invented numbers.
BatteryFits ranks cordless battery and charger listings by verified platform fit, genuine-vs-aftermarket risk, stated capacity, and live availability. This is a compatibility and buying guide, not a lab report — we don't bench-test cells or claim numbers we haven't measured.
What We Check
The compatibility checklist
Platform compatibility
Verify which tools a pack physically and electrically fits — brand, voltage class, and platform generation — against manufacturer compatibility charts and listing data.
Fit is the single most common buying mistake with cordless batteries. Getting this wrong wastes money and time.
Genuine OEM vs aftermarket
Flag whether a listing is manufacturer-original or a third-party replacement, and source products through Amazon's catalog API rather than hand-typed specs.
Genuine and aftermarket packs carry very different warranty and risk profiles — buyers deserve to know which they're looking at before they compare price.
Stated capacity and features
Record the Ah rating, fuel gauge, and other specs as published by the manufacturer or seller listing. We do not run our own capacity or runtime tests.
Capacity claims are a major driver of price and are the first thing buyers compare — we report what's stated, not what we measured, and we say so.
Live availability and price
Pull current listing data via the Amazon Creators API so prices and in-stock status reflect the latest catalog check, not a stale snapshot.
A great pack that's out of stock or discontinued isn't a useful recommendation.
Ranking Formula
A platform-fit rating
The rating weighs whether a pack fits your platform first, then the genuine-vs-aftermarket tradeoff, then stated capacity, then live availability and value. It is not a safety score.
35%
Platform fit
Confirmed compatibility with the brand's platform and specific tool generation.
25%
Genuine-vs-aftermarket risk
OEM status, warranty coverage, and stated protection-circuitry tradeoffs.
20%
Stated capacity and features
Published Ah rating, fuel gauge, and kit contents as listed by the seller.
20%
Live availability and value
Current in-stock status and price against comparable packs on the same platform.
Independence Guardrails
Clear incentives, clear limits.
This site earns from some outbound links, including Amazon. That keeps the lights on, but it does not buy a rank, hide a tradeoff, or turn a bad-fit pack into a pick.
- We do not bench-test cells, measure runtime, or lab-evaluate batteries.
- Compatibility is a fit determination, not a safety endorsement.
- Affiliate links never change placement or ranking.
- If a claim can't be sourced from the manufacturer or listing, we don't make it.
Want the fast path?
Start with your tool platform, filter by capacity and genuine-vs-aftermarket, then read the individual review before buying. The right pack is the one that actually fits your tool.
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