Anyone has purchased these Wulills 200AH 24v LiFePo4 batteries ?

Been eyeing these up myself actually — they keep appearing in my Amazon recommendations and the price point is very tempting compared to the Fogstar Drift range.

A few things I'm wondering before I'd take the plunge:

• BMS quality — does anyone know if it's a proper active balancer or just passive? On my van build I got badly stung by a cheap BMS that couldn't handle regenerative charging from the alternator
• Cell origin — are they claiming CATL or EVE cells, or is it the usual vague "Grade A" marketing speak?
• UK warranty support — this is the big one for me. If something goes wrong, are you dealing with a UK returns address or shipping back to China at your own cost?

I'm currently running a 24v Victron system on the boat and debating whether to expand capacity cheaply or just bite the bullet on another Fogstar unit where I know what I'm getting.

Has anyone actually load tested these properly? I'd love to see real discharge curves rather than just the spec sheet numbers. The claimed 200Ah at 24v sounds great on paper but whether it delivers at meaningful C-rates is another question entirely.

If someone's already got one hooked up to a Victron SmartShunt I'd be especially keen to see the data — that'd tell us everything we need to know pretty quickly.

@BorderCamper — snap, same thing happened to me! They kept popping up and I nearly pulled the trigger last month for my narrowboat setup.

What put me off was the lack of any UK support or warranty pathway. With Fogstar you've got an actual UK address to send things back to if it all goes wrong. With these no-name Amazon listings, what happens if a cell goes out of balance after 6 months?

Also noticed the spec sheet looked a bit... copy-pasted? The cycle life claims seemed identical to several other rebadged cells I'd seen.

Has anyone actually opened one up to check what cells are inside? That's usually the real question with these budget options — are we looking at Grade A CATL or something considerably less exciting? Would massively change whether the price difference is actually worth it.

Wulills is doing that thing where the brand name looks like it was generated by a drunk keyboard — usually means it's a rebranded CATL cell in a box with a BMS that'll throw a fit the moment your Victron MPPT sneezes at it.

Ran a cheap no-name 24v pack in the garden office two winters ago; BMS comms were nonexistent, ended up bypassing it entirely and fitting a proper JK BMS — cost me nearly as much as just buying Fogstar in the first place.

Amazon "tempting price" almost always means hidden costs down the line.

@DuctTapeDave 😂 "drunk keyboard" is exactly how I'd describe it — genuinely thought it was a typo when I first saw it.

Look, I'd want to know if there's any real BMS data behind these. Plenty of these Amazon-drop brands are just rebranded cells with a mystery BMS slapped on. Could be fine, could be a bin fire waiting to happen — literally.

For similar money I'd stretch slightly toward Fogstar Drift or even hunt a second-hand Pylontech stack. At least you know what you're getting and there's a community behind them if something goes wrong.

That said — if anyone's actually opened one up and can confirm the cell brand inside, that changes the conversation completely. Sometimes these things are hiding decent EVE or CATL cells underneath the dodgy branding.

@DuctTapeDave the drunk keyboard thing is a fair point but honestly half the Chinese cells powering decent batteries have equally unpronounceable brand names 😅

Thing I'd actually want to know before buying any of these obscure Amazon listings:

• Who makes the actual cells inside? EVE, CATL, CALB = decent. "Grade A proprietary cells" = run
• Does it have a proper BMS with balancing, or just basic protection?
• Any UK-based warranty support, or is it a "post it back to Shenzhen" situation?

I've got Fogstar Drift in my garden office setup and the peace of mind knowing there's actual UK support matters more than I expected — had a query and they actually responded properly.

Wulills specifically — couldn't find much community data on cycle testing or real capacity verification. That silence is the bit that puts me off more than the name tbh.

@QuietTrekker raises something worth dwelling on — the cells inside are really the whole story.

I spent about three weeks last winter researching a similar no-name 24V LiFePo4 before pulling the trigger on Fogstar instead. The thing that killed my confidence wasn't the brand name, it was the documentation trail. Asked the seller directly for cell provenance, cycle test data, capacity verification — got back marketing PDFs with suspiciously round numbers.

With emergency backup applications especially, you really want to know what you're sitting on. My setup runs critical kit through winter power cuts, so I needed that paper trail.

The questions I'd put to any seller before buying:

• Which cell manufacturer specifically (CATL, EVE, CALB?)
• Independent capacity test results, not self-certified
• What BMS protection thresholds are configured at

If Wulills can answer those clearly, that changes the conversation considerably.