I take my dead batteries to Batteries Plus+ -----Original Message----- From: altusmetrum [mailto:[email protected]] On Behalf Of David Carter Sent: September 01, 2015 07:32 To: Altus Metrum <[email protected]> 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 >> >> _______________________________________________ >> altusmetrum mailing list >> [email protected] >> http://lists.gag.com/mailman/listinfo/altusmetrum > > _______________________________________________ > altusmetrum mailing list > [email protected] > http://lists.gag.com/mailman/listinfo/altusmetrum _______________________________________________ altusmetrum mailing list [email protected] http://lists.gag.com/mailman/listinfo/altusmetrum _______________________________________________ altusmetrum mailing list [email protected] http://lists.gag.com/mailman/listinfo/altusmetrum
