Battery in cold garage

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Battery in cold garage

Postby Burgerman » 17 Feb 2021, 12:30

Hope your well how’s Covid over there?
Can I ask a favor can you post to those that have gel batteries why it’s import to charge every day

3rd person that follows you hear in the US and charging once a week and chairs are in cold garages I think it would be a big help

Thank you
--
Sincerely,
Timm & Crystal


Not only gel batteries. ALL lead based batteries need to be 101% full as much as they can be. As often as practical.
At least once every 10 to 14 days they need to be left on charge after the green light comes on, for 24 hours.

After the green light comes on on most modern chargers, they ARE still charging! It is just at a very slow rate at a lower voltage. And if you want them to last a long time then you should always do this, for 24 hours up to as long as a week on mistreated older batteries. If you just wait for green and disconnect every time they will sulfate (sulphate in english!). And this builds over time and your battery is then toast.

But its important that you don’t charge at very low temperatures. Say a long way below freezing. And to note that a FULLY charged battery cannot freeze.

And its important that the charger is set up properly for gel batteries. Most are not. They often tend to be the type that claim to charge AGM or Gel. Well that’s not possible! Use a volt meter. The voltage should read 28.20V room temperature or a little less just before the green light comes on. And not go above this voltage at any time for more than say a minute or two.

*****************************

1. Charge fully which means 8 hours or greater if possible any time you used the chair even if you drove it 10 yards. And when possible LEAVE it connected with the green light saying done, for 12 to 24 hours. If you need to use the chair then no problem. Do so.

2. Charge fully (24 hours or more) at least weekly if used daily. That will make sure the battery doesent have a short life.

3. And charge for 24 hours every 14 days if unused. A chair that is turned OFF still takes power at a low rate discharging the battery.

4. STORAGE. If the battery is fully charged, for 24 hours, and a battery wire is DISCONNECTED/Unplugged or a breaker is switched OFF, then you can store it for 3 months without charging safely. Recharge 24 hours or longer every 3 months. And then disconnect again.

This applies to all lead batteries, gel, AGM or wet acid, etc. It also applies if kept outside in winter, or in a warm building/bedroom.
Remember that warmer temperatures kill batteries faster. They age and deteriorate much faster in warmer storage conditions. So the battery doesent mind being in a cold garage. Quite the opposite. But they will perform badly, and give much less range if they are really cold. And better in summer!
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Re: Battery in cold garage

Postby Rollin Positive » 17 Feb 2021, 15:10

Perfect thank you! :thumbup:
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Re: Battery in cold garage

Postby Burgerman » 17 Feb 2021, 19:58

As well as the importance of making sure your batteries of all types, AGM, Gel etc get a complete charge (a long soak on the 3rd float stage) on a regular basis, so as to get a much longer service life. I also draw your attention to this:

A gel battery at room temperature of 20 to 25Centigrade need to be charged at between 27.6V MINIMUM and 28.2V MAXIMUM during the charge. Note that this is before the green ready light.
An AGM battery should be charged at 28.8V MINIMUM to 29.2V MAXIMUM during the charge.

Now MOST generic mobility chargers are dismal. They claim to be able to charge all sealed batteries inc lead acid, lead gel, AGM etc. This isnt possible. Most of them are configured to charge AGM batteries as these are cheap and more common. They will charge a Gel battery, but they reduce its service life very markedly.

Heres MK graph. It shows you the result on service life of charging at just a few tenths of a volt too high.

This is the 2nd thing that is finishing off gel batteries fast!
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Re: Battery in cold garage

Postby martin007 » 17 Feb 2021, 22:57

A gel battery at room temperature of 20 to 25Centigrade need to be charged at



25ºC?
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Re: Battery in cold garage

Postby Burgerman » 17 Feb 2021, 23:10

Centigrade.

If its warmer, a lower voltage is needed. If its cooler a higher charge, and float voltage is needed. But we typically charge at room temperature.

See:
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Re: Battery in cold garage

Postby martin007 » 17 Feb 2021, 23:52

20ºC


mk.jpg
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Re: Battery in cold garage

Postby Burgerman » 18 Feb 2021, 00:34

Yes. But remember that if your room is 20C your batteries may be 3 or 4 degrees warmer. And its those that matter.

But its not critical. In high summer, just drop the voltage a few tenths. If you can. If not then you have no choice anyway!

Worst case? You are using a mobility charger that charges at 14.4V or rather 28.8V for two. Thats MOST mobility chargers. And its 35C in texas. So you are charging a gel battery at much too high voltage. And worse, its telling you its done far too soon. So you never fully charge it. And this, combined with high discharge levels because its summer so you go further. These three things may mean battery trouble in 3 to 9 months.

Best case, CORRECT charge voltages, cooler climate, charged for 16 to 24 hours after every use, and dont discharge more than 60 percent. That may give you a battery life of 2 or 3 years or more.

Esp if you ALSO top up for an hour or so in the middle of your day as well as the overnight complete charges to keep the average discharge level low. Do that and you might get a good 5 years from them
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Re: Battery in cold garage

Postby Rollin Positive » 18 Feb 2021, 20:57

To go the other direction what about extreme heat I know it can get to 120 here how's that play out in running time and charge time

I use to be a person that help 2nd and 3rd chairs in my garage till we talked

Now all are in my office
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Re: Battery in cold garage

Postby martin007 » 18 Feb 2021, 21:34

Burgerman wrote:Yes. But remember that if your room is 20C your batteries may be 3 or 4 degrees warmer. And its those that matter.

But its not critical. In high summer, just drop the voltage a few tenths. If you can. If not then you have no choice anyway!

Worst case? You are using a mobility charger that charges at 14.4V or rather 28.8V for two. Thats MOST mobility chargers. And its 35C in texas. So you are charging a gel battery at much too high voltage. And worse, its telling you its done far too soon. So you never fully charge it. And this, combined with high discharge levels because its summer so you go further. These three things may mean battery trouble in 3 to 9 months.

Best case, CORRECT charge voltages, cooler climate, charged for 16 to 24 hours after every use, and dont discharge more than 60 percent. That may give you a battery life of 2 or 3 years or more.

Esp if you ALSO top up for an hour or so in the middle of your day as well as the overnight complete charges to keep the average discharge level low. Do that and you might get a good 5 years from them





I agree with you.
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