Bought a cheap cordless tool from Amazon — a Blue Ridge drill, an MZK mower, a Hychika saw — and now need a spare battery? This hub covers what’s officially documented for the budget and marketplace brands people ask us about most, which brands have quietly gone dormant, and what to do when the battery is the weak link. The short version: none of these brands publishes any cross-brand compatibility — but the details per brand matter.
Quick Answer
- Within a brand: most budget brands run one battery platform per voltage — but several scope it to a logo (“Omega 20V”, “POWR+”), not the whole brand history. Match the logo on tool and battery.
- Across brands: no budget brand we’ve researched documents any cross-brand battery compatibility. Marketplace adapters are unofficial and carry real safety risks.
- The bigger risk is supply: several of these brands now show sold-out or delisted batteries. Before buying any budget cordless tool, check a replacement battery is actually purchasable.
- Surprise finding: some brands UK buyers search for aren’t UK brands at all — Benchmark and Radley are Canadian (Home Hardware), ToolPro is Australian (Supercheap Auto).
At a Glance: What Fits What
Every brand below runs one proprietary pack per platform. The column that matters most is the fourth one — and it reads the same the whole way down.
| Brand | Platform | Fits its own tools? | Cross-brand fit | UK availability | Spare battery status |
|---|---|---|---|---|---|
| Blue Ridge | 18V (Max 20V) | BR9002 pack fits Blue Ridge 18V tools | None documented | Amazon UK (manufacturer listed as Positec) | Amazon UK BR9002 listing showed “currently unavailable” (Oct 2026) |
| Benchmark | Omega 20V | 8.0Ah pack: tools with the Omega 20V logo; 2.5Ah pack: Benchmark 20V Max tools | None documented | No UK channel (Home Hardware, Canada) | Canada only |
| MZK | 20V | Official: interchangeable across all MZK 20V products | None documented | Amazon UK (kits); no standalone pack found | Official store: 4Ah sold out, no batteries listed (Oct 2026) |
| Seesii | 21V (also 40V) | 21V packs for 21V Seesii tools; Seesii says 21V and 40V packs are not interchangeable | None documented | Amazon listings | Official store: 21V 4Ah sold out (Oct 2026) |
| Hychika | 18V / 20V | Sold “for Hychika power tools” — confirm your model | None documented | Amazon | Official store: 2Ah in stock, 4Ah unavailable (Oct 2026) |
| Radley | 20V Max | Only tools carrying the POWR+ logo | None documented | No UK channel (Home Hardware, Canada) | Canada only |
| Rockwell | 18V LithiumTech (later 20V MaxLithium) | Within its own line | None documented | No official UK channel | RW9161 not listed on Rockwell’s site; 20V RW9351.1 listed |
| ToolPRO | 12V | 4.0Ah 12V pack sold separately | None documented | No UK channel (Supercheap Auto, AU/NZ) | AU/NZ only |
| Stanley FatMax | V20 (18V) | Official: interchangeable with other V20 products; more than 50 tools | None — incl. Black+Decker & DeWalt | Sold in the UK | Listed on Stanley UK |
Starter packs by platform
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Before you buy: check that the size, fitting/bore and maximum-rated speed marked on the accessory match what your tool’s manual specifies. We have not physically tested these products; listings are compiled from published specifications. These are affiliate links.
Availability and stock notes reflect the date of checking and move quickly with marketplace brands — re-check before buying.
Brand-by-Brand: What’s Officially Documented
Blue Ridge (18V / “Max 20V”)
Amazon UK lists Positec — the group behind Worx and Rockwell — as the manufacturer of Blue Ridge. The spare battery is the BR9002 18V (Max 20V) 4.0Ah, and its listing says to use it only with Blue Ridge 18V products (drills, trimmers, hedge cutters, sanders, multi-tools, recip saws and jigsaws). The listing carries “Powershare Platform” branding — the same platform name Positec uses for Worx — but no official statement says Blue Ridge packs fit Worx tools, so we don’t claim it. In October 2026 the Amazon UK BR9002 listing showed “currently unavailable”; check stock before relying on the platform.
Benchmark (Omega 20V) — a Canadian brand
Benchmark is sold by Home Hardware in Canada. Its current packs are branded Benchmark Omega 20V (2.5Ah and 8.0Ah). Home Hardware’s 8.0Ah listing says it is compatible with Benchmark cordless products “with the Benchmark Omega 20V logo”, while its 2.5Ah listing says it is for all Benchmark 20V Max cordless tools — so check the logo and the listing for your tool. There’s no UK retail channel; replacement supply runs through Home Hardware in Canada.
MZK (20V)
MZK is an Amazon garden-tool brand; its official site names the company as S&G International Industry Inc. and describes its 20V battery as an “interchangeable battery for all MZK 20V products” — a genuine one-platform claim within the brand. The catch: in October 2026 the official store showed the 20V 4Ah pack sold out and listed no batteries, and we found no standalone MZK battery listing on Amazon UK (only tool kits and a charger). If you own MZK kit, a spare battery bought when available is cheap insurance.
Seesii (20V/21V)
Seesii sells cordless impact wrenches, ratchets, mini chainsaws and polishers through Amazon. Its replacement packs are 21V (2.0Ah and 4.0Ah; Amazon US models T1820-5 and T1840-10). The Amazon listings say the 4.0Ah fits all 21V Seesii models and the 2.0Ah most models, and Seesii’s own store warns that its 21V and 40V batteries are not interchangeable — match your exact model before ordering.
Hychika (18V/20V)
Hychika sells 18V/20V packs (2.0Ah, 4.0Ah) and 2.0A and 4.0A chargers. Its store sells batteries for Hychika power tools rather than making a blanket all-tools claim (the 4.0Ah page says it must be used with Hychika models and chargers), so confirm your tool model. In October 2026 the official store showed the 2Ah pack in stock and the 4Ah pack unavailable. Treat spares as at-risk.
Radley (20V Max) — not the UK Radley
The “Radley” cordless tools people search for are another Home Hardware Canada exclusive (batteries JDB5188 5.0Ah and a 2.0Ah pack), officially compatible with Radley products carrying the POWR+ logo. It has no connection to the British handbag brand, and no UK retail channel exists.
Rockwell (18V LithiumTech)
Rockwell is a Positec brand focused on North America. Its legacy 18V “LithiumTech” line used the RW9161 pack; its site now lists the 20V MaxLithium RW9351.1 battery and leads with oscillating tools such as the Sonicrafter. We did not find the RW9161 on Rockwell’s site, so expect third-party replacements or used packs. If you run vintage Rockwell 18V kit in the UK, plan its retirement rather than chase batteries.
ToolPro (12V) — an Australian brand
ToolPRO is sold by Supercheap Auto (Australia/NZ). A 4.0Ah 12V battery pack is sold as a separate SKU alongside its 12V tool kits — in Australia and New Zealand only. There’s no UK channel.
Stanley FatMax V20 (18V) — the mainstream comparison
Stanley’s V20 system (18V in UK naming; batteries SFMCB202 2.0Ah, SFMCB204 4.0Ah) is a real UK platform. Stanley says its battery packs are interchangeable with other V20 products, and that the system has more than 50 tools. The question we’re asked constantly: do FatMax packs fit Black+Decker or DeWalt tools, since all three are Stanley Black & Decker brands? No — each maker lists compatibility only within its own system, and no official cross-compatibility exists. Only unofficial adapters bridge them. Our Stanley Black & Decker 20V cross-compatibility page covers that family in detail, and the main compatibility chart shows how the mainstream platforms line up.
The Pattern (and What to Do About It)
Across every budget brand the story repeats: one proprietary pack per platform, zero documented cross-brand compatibility, and battery supply that can vanish while the tools still work. Practical rules:
- Before buying: check the brand sells a standalone replacement battery, in stock, today. If not, the tool has a built-in expiry date.
- If you already own one: buy the spare pack while it’s available.
- If the battery’s dead and unobtainable: a third-party replacement pack is the only route — read are third-party tool batteries safe? first, and stick to certified packs from sellers with a returns route.
- Adapters: 3D-printed and marketplace adapters exist for some of these platforms precisely because no official route exists. They bypass the electrical protection design — see our adapter guide for the risks before considering one.
Safety: Third-Party Packs and Cheap Cells
The Power Tool Institute warns that counterfeit batteries are not certified by any recognised lab, and that knock-off packs risk problems up to “a battery failure that may cause a fire or explosion”. London Fire Brigade advises using the charger supplied with a battery or one recommended by the manufacturer, buying branded, genuine products, and never leaving a battery charging unattended. With budget brands the price gap between a genuine and no-name pack is small; buy the genuine one while you can.
Frequently Asked Questions
Is there a Blue Ridge battery compatibility chart?
The official picture is one line: the BR9002 18V 4.0Ah pack fits Blue Ridge 18V tools. Despite sharing Positec parentage and “Powershare” wording with Worx, no official Blue Ridge–Worx compatibility is documented.
Do any budget-brand batteries fit other brands’ tools?
No budget brand we’ve researched documents any cross-brand compatibility. Physical lookalikes exist, but pack electronics, rails and protection differ — treat every cross-brand fit as unsupported.
My budget tool’s battery is discontinued. What now?
Certified third-party replacements (where they exist) are the only route, with the safety caveats above — or retire the tool to mains-powered work and put the money toward an active platform with a long battery commitment.
Are Stanley FatMax batteries compatible with DeWalt?
No. Stanley FatMax V20, Black+Decker and DeWalt are all owned by Stanley Black and Decker, but each lists battery compatibility only within its own system, with no official interchange; only unofficial adapters bridge them.
How We Compile This Guide
Every compatibility statement on this page comes from the brand’s own listings, official stores or trademark/corporate records, checked in August 2026. Where a brand publishes nothing — which is common in this segment — we say “not documented” rather than guessing. Stock observations reflect the date of checking and can change quickly with marketplace brands.
Safety disclaimer: Lithium-ion batteries can cause fires if misused. Use manufacturer-approved batteries and chargers, never leave packs charging unattended, and treat unofficial adapters and uncertified replacement packs as a genuine fire risk. This guide is general information only; use at your own risk.
