I used to take mine to Radio Shack but don't know what will happen if all the
franchises go belly-up with their corporate financial problems.Good question.
Any other places? I have some SLA's I'd like to dispose of properly. I have a
large capacity one I didn't tend to properly for storage like periodically
charging and it died after of year. Was nearly brand new. Kurt KC9LDH
From: David Carter <[email protected]>
To: Altus Metrum <[email protected]>
Sent: Tuesday, September 1, 2015 9:32 AM
Subject: Re: [altusmetrum] Battery care and maintenance
Follow up: What’s a safe disposal method for a dead battery? :)
Dave
> On Sep 1, 2015, at 10:08 AM, Kieran Sullivan <[email protected]> wrote:
>
> The battery is a single cell LiPo battery with all protection circuitry
> removed. That means you have to make sure you do not discharge it bellow 3.3V
> (best not go below 3.6V). The charge circuitry should make sure that the
> battery does not go above 4.2V while charging either - but that’s already
> done perfectly by the Telemetrum.
>
> So, if you drain the battery below about 3.3V by leaving the telemetrum
> switched on, the battery will die and stay dead. The swelling of the battery
> is a great indication that it needs to be replaced.
>
> This is all ‘normal’ for a LiPo and nothing really to do with the Telemetrum
> itself. Another best practice is to discharge the battery to a long term
> storage level - I think that’s around 3.8V or so if you’re not actively using
> it for a few weeks.
>
> Another really good tip is to never puncture the battery by drilling through
> it or using a screw that’s too long while fitting the avionics bay - DAMHIKT!
>
> Kieran
>
>> On 1 Sep 2015, at 14:51, David Carter <[email protected]> wrote:
>>
>> I was let down by the battery last weekend. While it is probably my fault,
>> it meant I had to swap out the TeleMetrum for a non-trackable flight
>> computer. This led to an hour of whacking bushes so to speak in farmers
>> fields. This is what I got the TeleMetrum to prevent. So I have some
>> questions about the best way to care for and handle the battery. (I’m using
>> the 900 MaH LiPO)
>>
>> When I last used the device, I’d returned from the field exhausted. I just
>> set the rocket aside with the battery still connected to the TeleMetrum. I
>> knew this would drain the battery, but I thought it would be no worse than
>> that. When I did take it out to charge, I found that I’d actually left it
>> on, so it had been transmitting until it died. Oops. So I put it on to
>> charge overnight before bringing it to the field.
>>
>> I’d never actually checked it until I got to the field. The battery hadn’t
>> charged at all. It was dead. I put it on a car charger for a little while,
>> but I was getting nothing. So I had to swap it out for another, less
>> capable, computer. When I removed the battery from the foam I had wrapped it
>> in, I also noticed that it had swollen, and was no longer the flat battery I
>> had put in.
>>
>> So my questions are:
>>
>> 1. Is it normal for a battery to fail after being fully and completely
>> discharged, or do I have a bad battery?
>> 2. Is the swelling of the battery normal? If not, what would cause this?
>> 3. What are some good ‘Best Practices’ for the care and handling of the
>> battery?
>>
>> David Carter
>> NAR 98850 Level 2
>> KC3FEW
>>
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>
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