OEM/ODM 4800Wh Lithium Battery with Wide Temperature Range -20°C to 60°C

So we're going with the LFELI-48100 for the cold storage backup project — the -20°C discharge spec was the main driver for us, and UL and CE certs are already on file from the last batch they sent over.

They confirmed 4800Wh nominal at 48V and 100Ah, which lines up with what we need for the 5-hour runtime requirement, and the cycle life is quoted at over 2000 cycles at 1C full depth of discharge, which is better than the 1500 cycles we were seeing from the other suplier.

One thing I double-checked was the IP65 rating — it's sealed enough for the warehouse enviornment where we'll have occasional dust and splashes, but they advised against submersion obviously, so we'll keep it above floor level.

Qualiy-wise they're sending COAs with each unit and they've got an in-house retest policy if we spot any variance — we usually have stock on these, but I'd confirm lead time since the M6 copper terminals need to be torqued to spec on install.

Anyway, the weight comes in at 55kg and dimnesions are 436 by 420 by 220 millimeters — not a light unit, but we've got the pallet jack for moving it, and the charge range is 0°C to 55°C, so we'll need to keep the charging area above freezing.

Orders placed for 6 units with a 5-year warranty, and the retest window is 30 days or so — I'll forward the PO and the COA samples when they arrive, probably within 2-3 weeks.