How it works Drop off a battery Battery packs Boutique Pro Professionals Blog Contact Our criteria
Resources & expertise

The cirBATT blog

Practical guides, technical analyses and everything you need to know about lithium batteries, their reuse and energy storage.

Standards and second-life batteries: why cirBATT is legally a manufacturer

A second-life battery — is it waste? a used good? a new product? For years, this unanswered question held back an entire industry. European law finally settled …

Read the article →

Where do lithium battery accidents actually come from? (the data)

When a lithium battery catches fire, the question that matters is rarely asked: where, exactly, did the problem start? In the cell? In the management electronic…

Read the article →

CID and PTC: how a lithium cell protects itself from overcharge and short-circuit

When we talk about lithium battery safety, we think first of the BMS — the electronics that monitor voltage, current and temperature. But what happens if the BM…

Read the article →

Why a second-life battery can be safer than a brand-new one

The intuition runs deep: a new battery must be safe, a used one must be a hazard. Yet recent scientific work on lithium cell safety tells a more nuanced — and s…

Read the article →

My e-scooter battery is dead — what now?

You get on your scooter, hit the throttle… and the range that used to be 20 km is now barely 5. Or worse: the battery won't charge at all. This is the scenario …

Read the article →

LFP vs NMC: which battery chemistry lasts longer?

LFP, NMC, NCA, LCO… the world of lithium batteries is full of technical acronyms. But two chemistries dominate the market for electric mobility and stationary s…

Read the article →

Can you store solar energy with a second-life battery?

You have installed solar panels and you watch with frustration as your meter feeds back to the grid the energy produced at noon that you will consume in the eve…

Read the article →

What does a BMS do in a second-life battery?

When talking about lithium batteries — new or second-life — the BMS is often mentioned but rarely explained. Yet it is the element that makes the difference bet…

Read the article →

How much is my used lithium battery worth? The real calculation rules

Before throwing away a lithium battery or taking it to a recycling centre, many owners wonder if it still has value. The answer is often yes — but the amount de…

Read the article →

End-of-life e-bike battery: all the options for responsible disposal

In France, more than 800,000 e-bikes are sold every year. With an average battery lifespan of 3 to 5 years, hundreds of thousands of batteries reach end-of-life…

Read the article →

Solar panels + battery: how do you calculate the size you need?

One of the most common questions from solar panel owners considering storage is simple: how many kWh of battery do I need? The answer depends on your consumptio…

Read the article →

Second-hand solar energy bank: how it works and where to find one?

A solar energy bank is simply a storage battery connected to your photovoltaic panels to keep the electricity produced during the day and consume it in the even…

Read the article →

How to calculate the real range of a lithium battery?

Your battery shows 100% charge but only lasts half the usual journey. Or your e-bike app estimates 60 km of range but you run flat at 35 km. These discrepancies…

Read the article →