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Old 02-01-2017, 06:48 PM   #1
dudeman1961
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Default Cold Weather Garage Storage

I have always lived in a warmer climate state and garage storage of the Segway has not been an issue with respect to it getting cold for its batteries. We moved north recently and the garage doesn't get below freezing but gets cold/close. Should I store it inside in the house?

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Old 02-03-2017, 11:58 AM   #2
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Default Store the batteries inside....

.... at a good charge.

I had mine stored in the garage until a month ago, and when I went to check on it, one battery had dropped to below charging level. I had to surface charge it before the on-board charger would recharge it.

The consensus is to charge the batteries fully, then glide for about ten minutes, then remove the batteries and store them indoors. That's what I did, and now I am monitoring their voltage on a weekly basis to insure no surprises.

My garage is heated to 32° F all winter. Mine is an XT with Li-ion batteries.

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Old 02-03-2017, 01:50 PM   #3
Don M
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Lithiums don't like very warm or very cold temperatures, it's true. They also don't like to be stored for long periods at a full charge.

If you have your Seg stored in the garage because you don't really have the space indoors, it would be ideal to just remove the batteries and store them inside. A 50% charge would be better than a full charge

If you leave the batteries on the machine for a year and don't plug it in, the machine will run the batteries down and possibly damage them, but if you remove them from the machine, you can store them for a year (or two) with a 50% charge and they will still show a 50% charge when you put them back on the machine . . . . no harm done

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Old 02-03-2017, 03:56 PM   #4
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Quote:
Originally Posted by Don M View Post

If you leave the batteries on the machine for a year and don't plug it in, the machine will run the batteries down and possibly damage them, but if you remove them from the machine, you can store them for a year (or two) with a 50% charge and they will still show a 50% charge when you put them back on the machine . . . . no harm done

Don
This advice is 100% false. I would encourage anyone seeking guidance to visit Segway.com, and under the support tab, download the Li-Ion Battery booklet. This booklet is inserted into every battery box sent to a dealer, and should be passed on the the customer after purchase.


If someone follows your advice of 50% SOC, the voltage will fall below the safety cutoff and the batteries will not accept a charge, which will produce a red light condition. A very costly mistake.
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Old 02-04-2017, 12:39 PM   #5
MuttonChops
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Default Winter Maintenance Tip

Segway Publication
Segway (PT) Winter Maintenance Tips, 2011 Document # 23034-00001aa
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File Type: jpg Segwinter.jpg (49.4 KB, 24 views)
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Old 02-04-2017, 03:40 PM   #6
Don M
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To each his own - A LOT more is known about the care and feeding of lithium cells than was known when the Segs were first built. There are over 7500 of the 18650 form factor cells in a Tesla pack and they don't recommend storing them with a high state of charge . . . . but maybe Elon Musk doesn't know better??

Note that my recommendation above was for batteries removed from the machine, so there is no draw on them - They will not self discharge hardly at all in a year or two

"Test data confirms that storage of lithium-ion batteries is best if the cell is partially discharged. In one test by Cadex Electronics ( http://www.buchmann.ca ) after 1 year storage at 25°C the non-recoverable capacity remaining is 96% when stored at 40% initial charge level, but only 80% if stored with 100% initial charge level. This effect is reduced at lower temperature and is a non-issue at 0°C. At higher temperatures the effect is much worse. Cadex's recommendations are to store below 15° C at 40% of full charge (3.5 volts per cell). Our experience is that with cells stored at room temperature for 3 years that the non-recoverable capacity did not decrease."

I have a couple extra sets of Seg lithiums in long term storage right now and the voltage hasn't decreased by even a tenth of a volt over the past 6 months

I also long term stored one of my Lithium EV's following Mitsubishi's recommendation of a 30% to 40% SOC and there was no measurable discharge after a year - It has a 330 volt, 50 AH battery pack (worth about $10K) so I wasn't about to take any chances!

Don

Last edited by Don M; 02-04-2017 at 03:50 PM..
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