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Sound Reinforcement - Forums for Live Sound Professionals - Your Displayed Name Must Be Your Real Full Name To Post In The Live Sound Forums => Wireless and Communications => Topic started by: Loren Miller on November 25, 2018, 09:21:18 PM

Title: A Sb900 battery and a QLXD mic walk into a garage...
Post by: Loren Miller on November 25, 2018, 09:21:18 PM
First winter with the sb900 batteries in play and I’ve noticed it taking a toll on the charge(to be expected), when put away almost full in my storage area (garage).

You guys taking them inside?

Only 1 gig in Jan/Feb (the poor zone) so far for me any storage tips I need to be aware of?

Thx
Title: Re: A Sb900 battery and a QLXD mic walk into a garage...
Post by: Steve Litcher on November 26, 2018, 12:52:35 PM
They do seem to be sensitive to the cold. We had a late-season outdoor gig a few weeks ago, and our SBRC unit showed "COLD" on the display for the batteries and wouldn't charge them.

Ambient temperature was about 25F.

If you don't need them, I'd probably bring them inside and keep 'em in a comfy location.
Title: Re: A Sb900 battery and a QLXD mic walk into a garage...
Post by: Loren Miller on November 26, 2018, 02:37:04 PM
They do seem to be sensitive to the cold. We had a late-season outdoor gig a few weeks ago, and our SBRC unit showed "COLD" on the display for the batteries and wouldn't charge them.

Ambient temperature was about 25F.

If you don't need them, I'd probably bring them inside and keep 'em in a comfy location.

Scary— guess the AA will never leave the bag!
Title: Re: A Sb900 battery and a QLXD mic walk into a garage...
Post by: Scott Helmke on November 26, 2018, 05:24:50 PM
It's fairly well known that cold temperature reduces the current flow from a battery. Shouldn't be a big surprise, since it's all based on chemical reactions.
Title: Re: A Sb900 battery and a QLXD mic walk into a garage...
Post by: Ade Stuart on November 26, 2018, 05:47:38 PM
First winter with the sb900 batteries in play and I’ve noticed it taking a toll on the charge(to be expected), when put away almost full in my storage area (garage).

You guys taking them inside?

Only 1 gig in Jan/Feb (the poor zone) so far for me any storage tips I need to be aware of?

Thx

I don't know how cold your winters are but state of charge may have a more significant affect on battery health. Li-ion batteries don't like being stored at full or very low SOC. Around 40% SOC may be optimal.

Lots of bedtime reading at https://batteryuniversity.com/
Title: A Sb900 battery and a QLXD mic walk into a garage...
Post by: Samuel Rees on November 29, 2018, 10:55:55 AM
I don't know how cold your winters are but state of charge may have a more significant affect on battery health. Li-ion batteries don't like being stored at full or very low SOC. Around 40% SOC may be optimal.

Lots of bedtime reading at https://batteryuniversity.com/

I have not got the ‘cold’ warning yet. This is my first winter with SBRC and I checked to see if it would give me any warnings last night around 34, but it didn’t (I didn’t actually charge, just checked to see if it would). I use the storage charge feature in the SBRC all the time. I wish Shure would add the ability to set a specific state of charge, such as 90%. This would be enough runtime for many applications and doing this often as opposed to charging to 100% would help me increase cycle life. This seems possible with a firmware update.


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Title: Re: A Sb900 battery and a QLXD mic walk into a garage...
Post by: Ade Stuart on November 29, 2018, 08:22:59 PM
Just saw this in the SBRC guide
"Recommended battery storage temperature is 0°C (10°F) to 25°C (77°F)"

We have a Nissan Leaf at home so I'm quite interested in battery longevity