Xiaomi & Redmi Batteries

Replacement Batteries — wholesale buying guide (Redmi K40)

Padded capacity labels are the number-one complaint in this category, which is why we measure on incoming inspection. Redmi K40 cells are sold on tested capacity; the printed number on the label is not the number that matters. UN38.3 and MSDS paperwork travels with every Redmi K40 battery, since that is what freight forwarders require. Cycle life separates a good Redmi K40 battery from a cheap one: a genuine cell holds capacity far longer than a re-wrapped copy.

Cycle life is the number most suppliers avoid publishing, because a cheap cell looks identical on day one and falls away by month six.

Specs and checks that matter

• Protection: PCM/BMS board and, on some models, a TI gauge chip sit on the cell
• Compliance: UN38.3 test summary and MSDS travel with every cell — these are what air freight asks for
• Grade scale: Original, OEM high-copy, aftermarket, refurbished — the grade sets cycle life, not the price
• Capacity claim: Rated mAh on the label and measured mAh on a tester are often different figures
• Cycle life: A genuine cell holds usable capacity markedly longer than a re-wrapped copy

Buyer questions

Which battery grade should I stock?

Most repair shops run OEM high-copy as the default and keep a small original line for picky customers or warranty work.

What shipping documents come with battery orders?

UN38.3 test summaries and MSDS are available for every battery line so your forwarder can move the shipment without a hold-up.

How do I know the mAh is not padded?

We measure on incoming inspection rather than trusting the label, and we will show the test figures on request.

What is the right way to store batteries?

Room temperature, partial charge, oldest stock out first — heat and full charge are the two shelf-life killers.

Related in this range

• Xiaomi & Redmi back covers
• Xiaomi & Redmi screens
• Xiaomi & Redmi camera modules
• All phone repair parts & batteries