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by jsantala
Fri Apr 01, 2016 4:54 am
Forum: Instruments - Radio/USB/Nav - CAN - Climate Controls - Remote
Topic: EvBatMon
Replies: 70
Views: 18931

Re: New Android App EvBatMon - reads your Battery Capacity

Update on OBDLink LX prize for the website: Normal prize is not $100, but $69.95. Currently on offer for $49.95.
by jsantala
Thu Mar 31, 2016 12:54 pm
Forum: Instruments - Radio/USB/Nav - CAN - Climate Controls - Remote
Topic: EvBatMon
Replies: 70
Views: 18931

Re: New Android App EvBatMon - reads your Battery Capacity

Do you have data on the effect of weather on perceived battery capacity? I know for a fact that the RR will show different readings during winter and summer, but is this based on perceived battery capacity, temperatures or just previous drives? I guess we'll find out soon though, since it's just now...
by jsantala
Thu Mar 31, 2016 1:32 am
Forum: Instruments - Radio/USB/Nav - CAN - Climate Controls - Remote
Topic: EvBatMon
Replies: 70
Views: 18931

Re: New Android App EvBatMon - reads your Battery Capacity

I have the software and it does what it promises. I have 39.5 Ah left on my 2011 C-Zero with around 27k km driven. I got it in 2014 so I don't know how well it has been taken care of. It only had less than 10k before me, so it's probably mostly degradation due to time and not as much kilometers driv...
by jsantala
Fri Mar 18, 2016 8:42 am
Forum: Off Topic
Topic: Tear down of a Hoverboard battery
Replies: 23
Views: 5731

Re: Tear down of a Hoverboard battery

LiPo and "Li-Ion" cells, like 18650s, or the cells in the i-MiEV, have a very small voltage drop usually. COmpare to LiFePO4, which when charged to say 3.5 volts will drop to 3.3 volts, always. The drop will of course also depend on how fast you charged the cell and did you taper the charg...
by jsantala
Fri Mar 18, 2016 4:33 am
Forum: Off Topic
Topic: Tear down of a Hoverboard battery
Replies: 23
Views: 5731

Re: Tear down of a Hoverboard battery

When you charge and disconnect a cell it will drop in voltage a little when the "surface charge" has dissipated and there's nothing wrong about that.

If you discharge the cell and it goes down in voltage afterwards, it's a bad cell. A good cell will probably bounce back a little.
by jsantala
Fri Mar 11, 2016 12:29 pm
Forum: General / Main Owners Forum
Topic: Winter Driving – What’s Your Coldest iMiEV Excursion.
Replies: 16
Views: 3659

Re: Winter Driving – What’s Your Coldest iMiEV Excursion.

I had left the C-Zero sitting at below -20˚C temperatures for three weeks this winter and the only thing different was that for the first few km the Turtle would light up when you pushed harder on the accelerator. The cold must have made the cell voltages go down, causing the Turtle to come out. Tha...
by jsantala
Tue Mar 08, 2016 5:32 am
Forum: Off Topic
Topic: Tear down of a Hoverboard battery
Replies: 23
Views: 5731

Re: Tear down of a Hoverboard battery

Luckily I don't have a lawn to worry about. :D
by jsantala
Tue Mar 08, 2016 5:04 am
Forum: Off Topic
Topic: Tear down of a Hoverboard battery
Replies: 23
Views: 5731

Re: Tear down of a Hoverboard battery

Cells may also appear completely healthy when charged, but immediately fail and plunge in voltage when put under load. Generally though, at least with LiFePO4-cells, if you bottom balance them and leave them be you can spot bad ones. They're the ones that don't recover in voltage, but instead keep d...
by jsantala
Sat Mar 05, 2016 11:22 am
Forum: Off Topic
Topic: Tear down of a Hoverboard battery
Replies: 23
Views: 5731

Re: Tear down of a Hoverboard battery

I purchased an electric bicycle with a dead battery. The original cells were shot, but in replacing the cells with smaller and newer Samsung INR 18650s I also ended up ditching the BMS altogether. The reason was that I found it was putting out a LOT of heat when top balancing the cells. Stacked righ...
by jsantala
Fri Feb 26, 2016 3:53 am
Forum: EVSE (Charging Stations)
Topic: EVSE Upgrade
Replies: 113
Views: 30769

Re: EVSE Upgrade

Accidentally came across this one on aliexpress, it seems to be rated for both voltages:

http://www.aliexpress.com/item/Type-1-J ... 18318.html

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