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Hi,first sorry for my English.I have strange problem with speed of my Aixam Mega city+.In the begining max speed was 65km/h ,i replaced old AGM batteries with 16 pcs LIFEPO4,after half year the speed start to decrease and for 3 months now max speed is 50km/h.Any ideas? I changed brushes and same, my friend check controler setting,it's look OK. I dont have idea why is that? 'New batteries are 150AH 2p16s, or now i have 300Ah around 53V.
 

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What BMS are you using? The cold weather will impact on the range and performance. Lifepo 4 really dont like 0c or close. Both charge is reduced and discharge.
 
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