cxeny 24v 300ah lithium battery

Never heard of Cxeny before but that's not necessarily a red flag — half my shepherd's hut runs on brands my spell-checker refuses to acknowledge. 🤣

That said, I'd be poking around for a few things before parting with my cash on a 24V 300Ah unit:

• BMS spec — does it actually publish the continuous discharge rating, or just wave vaguely at "high performance"?
• Cell source — EVE, CATL, or mystery cells from a factory that also makes novelty keyrings?
• UK warranty support — because sending a 30kg battery back to Shenzhen when it throws a tantrum is nobody's idea of fun

For context, I ran a Fogstar Drift 24V 200Ah for about 18 months before upgrading, and the peace of mind knowing I could actually get someone on the phone was worth every penny of the premium over the cheaper alternatives.

The price point on the Cxeny is tempting — I'll give it that. But I've seen enough "bargain" batteries on this forum turn into very expensive paperweights to be cautious.

Anyone actually own one of these and can report back on real-world cycle performance? Genuinely curious whether the BMS holds up over a full winter — that's where the cheap ones tend to show their true colours.

Never seen Cxeny before either. Worth digging into whether they publish actual cell specs — who's making the cells inside is the real question. A lot of these white-label packs are using CATL or EVE cells underneath, which is fine, but you want confirmation rather than just marketing fluff.

Main thing I'd check:

• BMS communication — does it talk to a Victron via CAN or at least have a decent app?
• Cycle count warranty — some of the lesser-known brands go quiet when you ask for it in writing
• UK importer — warranty means nothing if support's based purely overseas

At 300Ah/24V that's a decent chunk of capacity. Could be a bargain or a headache. Fogstar or a similar UK-stocked option might be worth comparing on price before committing.

@LochChild the cell question is the whole game really — "our premium grade A cells" on a product listing means absolutely nothing without a brand name and batch test data to back it up.

@OffGridGeek spot on about the cell lottery. I once cracked open a suspiciously light "280Ah" pack I'd bought for the narrowboat and found cells that looked like they'd had a previous life powering a budget vape. Capacity was fictional.

For a 24V 300Ah pack from an unknown brand, I'd want to see:

• Actual BMS specs — rated current, balancing type, low-temp cutoff
• Independent discharge curves, not marketing PDFs
• Real weight — lithium LFP at that capacity shouldn't feel like you could post it second class

Fogstar and similar UK-stocked options give you at least some recourse if it goes wrong. With grey-import unknowns, your warranty is basically a strongly-worded email into the void.

Not saying avoid it entirely — just go in with eyes open and a decent fuse between you and whatever's inside that casing.

@BoxerCamper that "suspiciously light" test is genuinely underrated — weight doesn't lie. A proper 300Ah 24V LiFePO4 pack should come in around 28–35kg depending on cell format. Anything meaningfully below that and you're already doing the maths on missing capacity.

With unknown brands I always run a full capacity test straight out of the box — charge to 100%, note the voltage curve carefully, then discharge through a known load and log actual amp-hours out. My Victron SmartShunt makes this dead easy. If Cxeny's 300Ah delivers 270Ah+ I'd call that acceptable. Under 250Ah and I'm straight onto a returns request before the window closes.

Also worth checking: does the BMS actually communicate, or is it a silent black box? Silent BMS in a van or shepherd's hut is a proper liability.

@MarinePhil weight is a decent proxy but worth being precise — a genuine 300Ah 24V pack with decent LiFePO4 cells should be roughly 28–35kg depending on the casing and BMS hardware. If it's much under 25kg I'd be asking serious questions.

The other thing nobody's mentioned: check whether the BMS specs are actually published. Not just "smart BMS with Bluetooth" marketing fluff — I mean actual continuous discharge current rating, balancing current, and cell-level protection thresholds. On my boat build I rejected two packs purely because the manufacturers couldn't (or wouldn't) provide that data. Fogstar will give you full specs without batting an eyelid. Mystery brands often can't.

No spec sheet = no sale, personally.