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I had the same with my 36v Neo Cross charger. I swapped the mains power lead with another (laptop I think) and that cured it. Don't ask me why! I think there might have been a very poor 240v (UK) connection

Good advice! I replaced the fan with exactly the one you recommend, polarity unchanged(?), and the pack came with useful little crimp connectors which made wiring very easy. I used to be able to hear the thing running in my garage from 20 yards away with the door closed (slight exaggeration)...

Many thanks. I thought I'd just get my wife's Bosch charger for her Motus and make a little plug but it's not that easy. The Bosch will only work if it receives the correct serial input. It's worse than an Enigma m/c and look what happened to the Germans. I'm going to replace the fan and I'm...

Has anyone fitted the Noctua 40mm NF-A4x10 FLX fan? My unintentional flippant reply about charging these things in the garage is coming home to roost! I'm cycling in the Outer Hebrides, Eriskay today, and previously was nearly chucked out of a pub on Berneray when I plugged it into their socket...

I wouldn't! The Neo BMS will switch the input off at 42v but the Evo charger will not and will try to fling over 50v in. The fan is noisy but I put up with it (it's in the garage so I can!). I've found that the slower you charge, the better will the BMS balance the charge.