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General Vintage Technology Discussions For general discussions about vintage radio and other vintage electronics etc. |
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11th Feb 2020, 10:08 pm | #1 |
Pentode
Join Date: Mar 2008
Location: Bury, Lancashire, UK.
Posts: 138
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Phone batteries
Hi all
Thought I had a great idea to use redundant lithium ion Mobile phone batteries to power my vintage radio valve heaters, via a regulator of course, question is will the battery have to be in a phone to charge it or Can i connect it to a phone wall charger directly or is there something in the phone that is part of the charging process, I think there is a thermistor in the battery on the third terminal to monitor temperature but that can't control the simple two terminal wall charger,if I do it direct am I likely to loose a few fingers,any ideas .keith. |
11th Feb 2020, 10:55 pm | #2 |
Dekatron
Join Date: Dec 2007
Location: Haarlem, Netherlands
Posts: 4,185
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Re: Phone batteries
It needs a stabilised current limited voltage to charge. 4.0 to 4.1V (in no case higher than 4.2V) and limited to about 1/5C just to be safe.
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12th Feb 2020, 8:37 am | #3 | |
Nonode
Join Date: Jun 2016
Location: Bognor Regis, West Sussex, UK.
Posts: 2,288
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Re: Phone batteries
Quote:
Peter |
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12th Feb 2020, 12:11 pm | #4 |
Moderator
Join Date: Jun 2003
Location: Oxford, UK
Posts: 27,787
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Re: Phone batteries
Standard mobile phone batteries are just a single lithium cell and can be charged by a charge controller chip using two connections. You can buy charge controller modules from Chinese eBay sellers for pennies which work with a standard 5V USB charger.
e.g. https://www.ebay.co.uk/itm/2PCS-TP40...e/202851920328 I use such a module to charge scavenged 18650 cells which I use to power workaday radios. |