4V Cordless Tools: CE Certification & Spec Compliance Guide

YJSG-500: a 3.7 V (4V class) two-use lithium cordless staple and nail gun with a 2000 mAh battery.

A 4V cordless tool is a hand-held power tool built around a 3.7 V nominal lithium cell. The "4V" designation names the battery class, not the working capability of the tool — which is why two products sold under the same description can differ completely in torque, runtime and certification scope, and why a purchase order written against the phrase "4V cordless tools" cannot be checked against any document.

This guide is written for importers, distributors, brand owners and OEM buyers comparing suppliers at the Research and Evaluation stage. It sets out the three constraints that decide whether a 4V cordless tool programme can actually ship: model-level certification, documented electrical specifications, and commercial terms such as customization, MOQ and lead time. The data used throughout is the published specification and certification record of the HOTAK PRO TOOLS 4V cordless range, produced at the Ningbo (Yinzhou) Yongjia Electrical Tools Co., Ltd. (YONGJIA TOOLS) manufacturing base in Ningbo, Zhejiang Province, China.

Problem definition: "4V" is a battery class, not a purchase specification

Every model in the documented HOTAK PRO TOOLS cordless range is rated at 3.7 V. What changes from model to model is everything that determines whether the tool fits a buyer's listing:

• Battery capacity — 320 mAh on the precision repair and craft models (YJPS-906, YJPS-907, YJGG-001, YJTS-3526), 800 mAh on the power screwdriver set YJPS-912, and 2000 mAh on the power screwdriver YJPS-902 and the cordless nail guns YJSG-500 and YJSG-501.
• No-load operating time — documented as ≥30 min (YJPS-906), ≥50 min (YJPS-912), ≥60 min (YJPS-902 and YJSG-501) and ≥120 min (YJGG-001).
• Torque, split between electric and manual — 0.15 N·m electric with 3 N·m manual on the precision tools; 2.5 N electric with 10 N·m manual on YJPS-912; three selectable electric levels of 2 N, 3.5 N and 5 N with 10 N·m manual on YJPS-902.
• Output speed — 220 rpm on the 320 mAh precision tools, 0–250 rpm on YJPS-912, and 0–280 rpm on YJPS-902.
• Charging behaviour — 500 mA charge current on the compact models and 1–1.5 A on the higher-capacity models, with a 5 V charge output voltage where documented (YJPS-902 and YJGG-001); stated charging time is 1 hour for YJPS-907 and YJTS-3526, and 120 min ±10 min for YJGG-001.

The practical consequence for a buyer is that the category term is not a purchase specification. The purchase specification is a model number plus the parameter set above — and the compliance document has to reference that same model number. When a supplier can only offer "a 4V cordless tool" without a model-level document, the buyer carries the verification risk alone.

Industry background: why certification became the first filter, not the last

Compact 3.7 V tools became a standard shelf category in DIY, craft, electronics repair and light assembly retail because they sit between manual tools and full-size 12 V or 18 V platforms: small enough to keep in a drawer, powered enough for the repetitive fastening that a hand tool cannot sustain. The same economics that make the class easy to list also make it easy to source badly, because the tools are inexpensive enough to be ordered without a full technical review.

Two pressures have changed that. The first is documentation. In the EU, powered hand tools sit inside the Machinery Directive framework, and the entity placing the product on the market is normally the one expected to hold conformity documentation and produce it on request. Battery-powered tools are also commonly screened for electromagnetic compatibility and for restricted substances such as those covered by RoHS, depending on the destination market — so a single "CE" claim on a product page is rarely the complete file. Buyers should confirm which documents their own compliance team requires before comparing prices.

The second pressure is retail qualification. Large chains audit the factory, not only the product. YONGJIA TOOLS holds ISO 9001 quality management certification, TÜV/GS product safety certification, BSCI social compliance certification and VPA (Verify Production Audit) approval, and has passed factory audits for Walmart (USA) and Kingfisher (UK). Those approvals are gate conditions for organized retail and they are separate from the model-level certificates that cover an individual cordless tool.

For a buyer in the Research stage, this reorders the evaluation. Certification comes first because it can disqualify a supplier regardless of price. Electrical specification comes second because it decides the application. Commercial terms come last because they can usually be negotiated.

Detailed solution: what a compliant 4V cordless tool file contains

Model-level CE certification

The cordless staple gun documentation shows the level of precision a buyer should require. The 5-in-1 cordless power staple gun, model YJSG-501, is covered by a CE Certificate of Conformity issued by TÜV Rheinland LGA Products GmbH under certificate number AM 50559365 0001. The certificate confirms conformity with EU Machinery Directive 2006/42/EC and with the standards EN ISO 12100:2010 and EN ISO 11148-13:2018. It was issued on 10 September 2022, is valid until 31 December 2030, and applies to the EU market. Critically, the scope names both the product and the model — 5 IN 1 CORDLESS POWER STAPLE GUN, Model YJSG-501.

A second CE Certificate of Conformity, number AM 50694538 0001, covers staple gun tackers (hand-operated tackers) against the same directive and the same two standards. It was issued on 2 March 2026, is valid until 31 December 2030, and is linked to models YJSG-105 and YJSG-023. A GS Product Safety Certificate, number S 50694620 0001, was issued on 18 March 2026 and is valid until 17 March 2031 for the German and EU markets; its scope is hexagon screw keys with ball end, tested against DIN ISO 2936-10.16 and AfPS GS 2019:01 PAK. All three documents were issued by TÜV Rheinland LGA Products GmbH.

CE Certificate of Conformity AM 50559365 0001 for the 5-in-1 cordless power staple gun, model YJSG-501, issued by TÜV Rheinland LGA Products GmbH.

Read the scope line first. A certificate that names a model proves that model. It does not transfer to a different housing, a different cell or a different switch assembly sold under a similar description.

Factory-level compliance, capacity and quality control

Product certificates answer the market-access question; factory approvals answer the supply question. The manufacturing base covers more than 45,000 m² with an integrated in-house chain running from mould development, forging and stamping through heat treatment, surface finishing and precision machining to assembly and packaging. The site employs 450 people, including 25 R&D engineers, and produces 18,000,000 units per year against a monthly capacity of 1,500,000 units.

Quality control runs at three points — incoming inspection, in-process inspection and final inspection — and after-sales support is provided remotely. The company has been accredited as a National High-Tech Enterprise in 2014 and recognized as a "Little Giant" enterprise in Ningbo, with an accumulated patent portfolio of 7 invention patents, more than 20 European patents, 50 utility model patents and over 100 design patents. Its products are exported to more than 100 countries and regions, with a customer network that includes international DIY and home-improvement retailers such as The Home Depot, Lowe's, Walmart, AutoZone, Kingfisher, Leroy Merlin and Auchan, and tool and industrial groups including TTI, ITW and CPI.

QC room: incoming inspection, in-process inspection and final inspection are the three control points behind the cordless tool programme.

Private-label and custom 4V cordless tool programmes

Custom 4V cordless tools are supplied on OEM/ODM terms, with colour and logo customization. The published commercial parameters are an MOQ of 600 units, a lead time of 30–45 days, and an export ratio of 95% across the EU, USA, Southeast Asia and South America. Customization applies to the tool and its packaging; within the wider range, the YJTS-3401 50 pcs ratcheting screwdriver set is an example of a set that ships in a durable box and is available for private label.

For a brand owner, the sequence matters more than the parameters. Colour and logo work on a model that is already covered by a certificate is a customization of a compliant product. Colour and logo work on a model that has no certificate file is a new conformity question, and the buyer should treat it as one.

YJPS-912 power screwdriver set: 3.7 V, 800 mAh, 2.5 N electric torque and 10 N·m manual torque.

Step-by-step: six checks before placing a 4V cordless tool order

Buyers can run the same six checks on any supplier. Each check either produces a document or does not.

1. Fix the destination market and the applicable directive. An EU launch and a Southeast Asian launch are not the same file. Confirm the target market first, because the certificate scope, the standards and the labelling requirements follow from it.
2. Match the certificate scope to the exact model. Ask for the certificate that names the model you intend to order, and read the scope line, the standard numbers, the issuing authority and the validity dates. For example, CE certificate AM 50559365 0001 names model YJSG-501, while CE certificate AM 50694538 0001 is linked to YJSG-105 and YJSG-023.
3. Cross-check the electrical specification against the file. Rated voltage (3.7 V across this range), battery capacity (320 mAh to 2000 mAh), electric and manual torque, output speed (0–220 rpm to 0–280 rpm) and charge current (500 mA to 1–1.5 A) should appear in the same document set that supports the certificate.
4. Verify the material and durability class. Hand tools in this range are built from CR-V6150 alloy steel with a hardness range of HRC 52–55. For staple gun bodies, supplier material comparison data distinguishes plastic (more than 7,000 shots), iron (more than 15,000 shots) and aluminium alloy (more than 30,000 shots) — a useful filter when a buyer is choosing between a household and a professional price point.
5. Verify factory-level compliance. ISO 9001, TÜV/GS, BSCI and VPA approval, plus the Walmart (USA) and Kingfisher (UK) factory audits, are the qualifications that organized retail buyers screen for.
6. Confirm the commercial constraints. MOQ of 600 units, lead time of 30–45 days, colour and logo customization, packaging format and after-sales support should be agreed before artwork is commissioned.

Use cases: matching 4V cordless tools to the job

Cordless upholstery and insulation fastening

The 5-in-1 cordless power staple gun YJSG-501 and the two-use YJSG-500 both run at 3.7 V with a 2000 mAh battery and 25 W output; YJSG-501 is documented at ≥60 min no-load operating time and is the model covered by the CE Machinery Directive certificate. In short, repeated fastening bursts, the 2000 mAh cell is the parameter that matters most to the user, not the "4V" label. Hand-operated equivalents remain part of the same programme: the YJSG-140 accepts fine wire staples of 6–10 mm (1/4"–3/8"), is made of CR-V6150 steel with a durable steel handle, and is described for decorative work and general fastening in household and manufacturing settings.

Electronics repair and precision assembly

YJPS-906 (electric precision repair tools set) and YJPS-907 (26 pcs cordless precision power screwdriver set) deliver 0.15 N·m of electric torque and 3 N·m of hand torque at 220 rpm, with a 320 mAh cell that keeps the tool light for small fasteners and repeated disassembly. Where the task is entirely manual, the YJTS-3140 43-piece mobile phone repair tool set provides 36 CR-V6150 precision bits in Phillips, slotted, hex, Torx, tamper-proof Torx, square, triangle, pentalobe, tri-point and spanner profiles.

Furniture assembly

YJPS-912, with an 800 mAh battery, 2.5 N electric torque, 10 N·m manual torque and 0–250 rpm, is sized for flat-pack assembly work. For higher daily volumes of fastening where runtime matters more than weight, YJPS-902 carries a 2000 mAh battery, three electric torque levels of 2 N, 3.5 N and 5 N, 10 N·m manual torque, 0–280 rpm output and a documented no-load runtime of ≥60 min.

Craft projects and light bonding

The YJGG-001 cordless hot-glue pen operates at 3.7 V from a 320 mAh battery at 4.2 W, with an operating temperature of 150 °C, a glue flow time of 60 seconds (released in 30 seconds), ≥120 min operating time and a full charge time of 120 min ±10 min. The published product range also lists a mini rotary tool for craft and finishing work; buyers should request the specification sheet for that model separately, because no rotary tool parameters are published in the current range documentation.

Home improvement and starter kits

The YJTS-3526 41 pcs household electrical screwdriver tools set packages the same 3.7 V, 320 mAh platform with 220 rpm output, 0.15 N·m electric torque, 3 N·m manual torque and a one-hour charge time — a format suited to gift, starter and compact cordless tool kit listings.

Comparison tables

The tables below use the published model specifications and certificate data only. They are organised so that a buyer can read the certificate scope against the model specification in one pass.

Table 1 — 4V (3.7 V) cordless tool specification comparison

Table 1: 4V / 3.7 V cordless tool models and published electrical specifications.

Table 2 — Certificate coverage matrix

Table 2: certificate coverage by model, standard and market, as published by the manufacturer.

Table 3 — Staple gun body material vs. expected service life (supplier material comparison)

Table 3: material comparison data used by the manufacturer when positioning staple gun price points.

Frequently asked questions

Conclusion: certify the model, then specify the tool

Certification is the constraint that decides whether a 4V cordless tool programme can ship, and it operates at model level rather than category level. CE Certificate of Conformity AM 50559365 0001 proves model YJSG-501 against EU Machinery Directive 2006/42/EC and the standards EN ISO 12100:2010 and EN ISO 11148-13:2018; CE certificate AM 50694538 0001 covers the tacker models YJSG-105 and YJSG-023 under the same standards; and GS certificate S 50694620 0001 adds German-market product safety coverage for ball-end hexagon screw keys under DIN ISO 2936-10.16 and AfPS GS 2019:01 PAK.

Around that documentation sits a specification grid — 3.7 V rated voltage across the range, battery capacity from 320 mAh to 2000 mAh, torque from 0.15 N·m to 5 N electric, runtime from ≥30 min to ≥120 min — and a set of commercial constraints: OEM/ODM with colour and logo customization, MOQ of 600 units, lead time of 30–45 days and remote after-sales support. Buyers who verify those three layers in order will know whether a supplier is a candidate before price is discussed at all.

The 45,000 m² manufacturing base in Ningbo, Zhejiang Province, where the 4V cordless tool range is produced.