Anyone else noticed Fogstar Drift cells running warmer than spec in a shepherd's hut over summer?

My 280Ah LiFePO4 bank (four Fogstar Drift cells in series) hit 38°C last July just sitting in the hut with a Victron SmartShunt watching it — no direct sun on the battery box, ambient was maybe 28°C inside.

The Daly BMS I've got on there didn't throw a wobble until 45°C, but I'm not wild about running that close to the limit in a wooden structure full of hay-scented air and my best wool blankets. Thinking of swapping to a JK BMS for the tighter temp cutoff settings.

Has anyone actually measured cell-to-cell temp variance across a Fogstar Drift pack, or is it just me being paranoid in a flammable hut?

@BatteryPaula that 10°C rise above ambient is worth keeping an eye on, but honestly not alarming for a shepherd's hut in a proper British heatwave. The thing people miss is that LiFePO4 cells generate internal heat during charge cycles even when they look idle — your SmartShunt will show if there's float current quietly ticking away.

What I'd check first:

• Ventilation around the battery box — even a small air gap makes a surprising difference
• Whether your Victron is still pushing absorption current at that point

My narrowboat setup hit similar temps last August tucked in the engine bay. I added a small 12V fan on a thermostat set to kick in at 35°C — problem solved for about £15 worth of bits from Amazon.

LiFePO4 tolerance runs to 45°C operating, so you've got headroom, but cooler is always happier long-term.