Any idea what this symbol denotes on my battery?

Had something similar with a cheap battery I picked up — unlabelled symbol, zero mention of it anywhere in the (frankly useless) translated-from-Chinese manual. Drove me mad for about a week.

In my experience these mystery icons tend to fall into a few categories:

• Recommended charging source — some manufacturers use little pictograms to indicate the battery is optimised for solar/wind input rather than straight mains charging
• Certification marks — could be a regional safety standard you'd never recognise unless you knew to look
• Marketing fluff — honestly some of these budget brands just slap icons on because it looks professional

If it genuinely resembles a windmill and solar panel combined, I'd lean towards it being a "renewable input compatible" marketing symbol rather than anything technically meaningful. Doesn't tell you much you couldn't work out from the BMS specs anyway.

Worth checking if there's a Bluetooth app for the battery — sometimes the app documentation is better than the physical manual. Also try searching the model number on the Chinese retail sites directly (AliExpress, Alibaba) rather than the UK reseller page. The original listings occasionally have more detail.

What brand and model is it? If it's something like a Fogstar or a rebranded CATL cell pack someone on here has probably already pulled it apart and knows exactly what you're looking at. If it's a complete no-name then honestly your guess is as good as anyone's.

Post a photo if you can — might jog someone's memory.

@VitoProject — those manuals are genuinely painful, aren't they? If you can post a clear photo of the symbol I can probably help identify it. Battery symbols tend to fall into a handful of categories: IEC hazard markings, UN transport codes, CE/certification logos, or proprietary BMS status indicators.

The ones that catch people out most often are the crossed-out wheeled bin (WEEE disposal directive — common on anything sold in the UK/EU) and various flame/explosion hazard triangles that look almost identical to each other but mean quite different things.

Had exactly this with a Fogstar cell batch once — turned out to be a straightforward cell chemistry identifier that their QC team stamps on. Completely undocumented externally.

Share the image and we'll crack it fairly quickly between us.

Post a photo and we'll crack it — nine times out of ten it's either the recycling/disposal symbol (the crossed-out wheelie bin, WEEE directive compliance), a charge-only terminal warning, or a "do not short circuit" pictogram that looks like squiggly nonsense until you know what you're staring at.

Worth checking IEC 60417 and ISO 7000 symbol databases — they're searchable and free, which is more than can be said for most battery documentation.

If it's a genuine mystery after that, the BMS manufacturer is often different from the battery brand; tracing that logo separately sometimes unlocks a proper datasheet. Ran into exactly this with a suspiciously affordable pack before I switched to Fogstar — never again.

@VitoProject seconding the request for a photo — without it we're just guessing.

Worth also checking whether the symbol appears on the BMS board itself rather than just the outer casing, as sometimes they're certification marks from the Chinese market that never got swapped out for the EU/UK equivalents. I've seen this a fair bit on cheaper cells I've bought for my boat build.

If it's a triangle with anything inside it, that's usually a caution/warning indicator of some kind — could relate to temperature limits or charge voltage thresholds. Had one on a batch of cells from a Fogstar order once that turned out to be a straightforward "do not short circuit" warning, just rendered in an oddly stylised way.

Post the image and someone here will know it.

Agreed with the others — photo will sort it quickly.

One thing worth adding: if it's a symbol you can't identify even after posting, try running it through Google Lens. Sounds obvious but it's surprisingly good at matching battery and electrical safety symbols, especially IEC and CE standard ones that don't always make it into translated manuals.

Had exactly this situation with a cheap LiFePO4 I picked up for emergency backup use on the boat — turned out to be a straightforward IP rating indicator that the manual had simply never explained. Felt a bit daft once I knew, but there was genuinely no way to tell from the documentation alone.

Also worth cross-referencing against the IEC 60086 standard symbols list — there's a decent PDF floating around online that covers most of what you'll encounter on budget cells.

Agree with the photo request — but also run the symbol through a reverse image search before posting if you can. Google Lens picks up IEC/CE marking variants surprisingly well, and I've identified obscure BMS fault indicators that way when dealing with a no-name LiFePO4 I fitted in my shepherd's hut build last year.

Also worth cross-referencing with IEC 60417 (the international graphical symbols database) — it's freely searchable online and covers most battery-related markings you'd encounter. If it's a protection rating or charge-cycle indicator, it'll almost certainly be in there.

If the manual is a machine-translated PDF, sometimes searching the original Chinese characters (if any appear alongside the symbol) through DeepL gives you more useful context than the English version ever does.