OK. I’ve fully charged the bike and checked the voltage across all of the batteries. It reads 66.1V. So it looks like they are getting a pretty good charge. I wonder if my range problem is just due to the very cold weather we’ve been having. It’s regularly been below zero here for the past couple of weeks.
I would guess the low temperatures are causing some loss of range.
This article explains quite well the effect of temperature on battery performance
So at around -10 deg C you will loose up to 50% of battery capacity. Whatever you do, do not try to charge lithium ion batteries in sub zero temperatures. Could cause the battery to explode. Bring it indoors to warm up first.
Thanks for this. Battery University is a wonderful resource.
Regarding charging lithium batteries at below zero temperatures I was aware that this could cause plating of the anodes and gradual deterioration so warming the battery first is good practice but have to say I was unaware of any H&S implications.
Do you have a link to this?
That’s good advice. I should put a wee heater in my garage then. I’ve been losing about a third of the capacity in temperatures between -1 and 2°C. So 50% at -10°C sounds about right.
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