I am in a very similar situation to the OP having just purchased a September 2017 4hs from a car supermarket and I have been getting really variable range readings (from 9 to 30 miles) after a full charge off a 13a home socket.
<span>I bought an <a href="http://www.amazon.co.uk/gp/product/B005 ... ecarfor-21
&" interlinkr"="" target="_blank">OBD2</a> dongle and with the free version of the phev watchdog app can see that the battery has a SOC of 77% and 31.2aH - I'm slightly surprised that it's so low and the car has only done 32k miles.</span>
I was considering taking it into my local dealer and seeing what they could do under the warranty (I have read several reports of people managing to get their local dealers to do the battery cell smoothing procedure under warranty) but am sure I will just be fobbed off.
Hugwi and all, sorry I didn’t see this until now. I managed to get a battery health check done last Monday for the car I want to buy - yes it did take some persuading and time! Pse see attached pics of Worksheets 1 and 2 that I was sent, which might help people on here.
Worksheet 1 says that the 'current capacity' of the battery/BMU is 37.8/37.7 Ah/amp - which seems to be good if the capacity for a new battery is 40? Since it looks like the ‘Requirement’ question, no. 3, says 'What is capacity for a new battery?’ being 40. Hence I assume 37.7 out of 40 is good? Although if this is the case I’m confused as to why the technician has written ’40' by hand - ie. why isn’t this figure already pre-printed if it is a standard figure to be compared to? Also not sure why he’s highlighted the 40 as opposed to the 37.8, as I thought it was the 'current capacity' I’m meant to be concerned with?
If anyone can inform me as to what all the other numbers mean I’d be grateful - eg. I think (but am not sure) that the cell voltages handwritten in the table under point no. 2.1 mean that the battery is in good health? Or under question no.s 4.1 and 4.2 what is the implication of testing the battery with the fan at 32 rpm and what does the ‘duty control %’ mean? If it is run at 10%?
According to another Mitsu dealer any amp reading above 25.6 means the battery is healthy. If this is the case it means the car I’ve just had tested has a healthy battery? Which implies yours is also good at 31.2 Ah - so why do you think it is bad please? As I’m hoping I haven’t misunderstood the info or been misinformed - especially as I’m hoping that all the readings mean the battery is good, so I should go ahead and buy the car.
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