GB 31241: The Standard Every Phone Battery and Power Bank Must Pass in China

If you make phone batteries, power banks, tablet or laptop batteries, you've definitely heard of GB 31241. But when asked "what does it actually test, and how is it different from the other standards?" most people just mumble "you have to pass it."

Let's break it down plainly.

What GB 31241 is

Full title: Safety Requirements for Lithium-ion Cells and Batteries Used in Portable Electronic Equipment. China's mandatory national standard, published 2014, in force since August 2015.

It covers batteries in the devices you use daily:

• Phones
• Tablets
• Power banks / mobile chargers
• Laptops
• Bluetooth earbuds, smartwatches

In one sentence: if the battery is lithium for portable electronics, it's governed by this standard. And it's mandatory — not optional, not "nice to have." No GB 31241 compliance, no China market.

What it tests: "don't ignite, don't explode, don't leak"

GB 31241's safety requirements cover a full range of scenarios: normal use, foreseeable misuse, fault conditions, plus environmental factors like temperature and altitude. Key tests:

• Overcharge: what happens when the battery is overcharged
• Overcurrent charge: constant-current charging at 1.5× the overcurrent protection value until the protection circuit trips — must not ignite, explode, or leak
• Overdischarge: state after excessive discharge
• External short circuit: positive and negative terminals shorted
• Drop and thermal shock: drops and rapid temperature changes

The bottom line on every test: no fire, no explosion, no leakage. Pass that and your safety design is acceptable.

Battery safety isn't just "passing a test" — it's designed in

The standard notes that battery safety depends on material selection, design, production process, transport and usage conditions. In other words — it's not something you test at the end; you have to design safety into the product:

• Material selection (cathode, anode, electrolyte)
• Protection circuit (how overcharge/overdischarge protection works)
• Structural design (short-circuit protection, pressure relief)

If residual risk remains after all that, you add marking and instructions to warn users. That's part of why two batteries with the same rated capacity can differ in price by multiples — the safety engineering inside.

How it differs from UN 38.3 and IEC 62133 (the common confusion)

Battery makers hit all three at once and often mix them up. The division of labor is clear:

• Shipping the battery (air/sea): pass UN 38.3
• Selling in China: pass GB 31241
• Exporting internationally: IEC 62133 is the passport

They don't conflict — exporters selling in China typically do all three.

Practical advice

1. Confirm your product is "portable electronics" — phone/power bank/earbuds batteries can't avoid GB 31241.
2. Don't only focus on testing — safety design (protection circuit, materials, structure) is the root; testing just verifies it.
3. For multi-market export: plan UN 38.3 (transport) + GB 31241 (China) + IEC 62133 (international) together — cheaper than doing them piecemeal.

Need the exact GB 31241-2014 clauses (overcharge/overdischarge test methods, protection circuit requirements)? Sign up at StdFlow (stdflow.com) and ask an AI agent to pull the full standard text with citations.