valve90210 Posted May 7, 2021 Share Posted May 7, 2021 I went to use my GT3C for the first time in quite some while only to find it wouldn't turn on. I put it on charge, gave it a bit of time and it switched on fine. However, when I unplugged the charging lead it switched off. It seems that it's not working at all from the battery, but will work if I have the charger plugged in. I gave it a test using a USB power bank plugged in and that worked fine but obviously is not ideal. There don't appear to be any physical signs of the battery having died, no swelling or corrosion etc but it just doesn't seem to be doing anything. Is it likely to just be that the battery is dead or is it possible there's an issue with the charging circuit or something? How best to check if the battery is dead? Quote Link to comment Share on other sites More sharing options...
walkbythesea Posted May 7, 2021 Share Posted May 7, 2021 What sort of battery is it? My radiomaster battery can be plugged into my balance charger for charging/testing if you don’t have a multimeter then would that be an option? Quote Link to comment Share on other sites More sharing options...
Bajadre Posted May 7, 2021 Share Posted May 7, 2021 true if a lipo could be too far drained 😞 like Walk said need to test the volts now see if you can bring her back or not can get lipo checkers for a couple of quid online Quote Link to comment Share on other sites More sharing options...
valve90210 Posted May 7, 2021 Author Share Posted May 7, 2021 I can certainly test it with a multimeter, but it' has 4 contacts so I'm not sure how best to test it. It is a lipo. I'll put up a pic when I get home later 1 Quote Link to comment Share on other sites More sharing options...
walkbythesea Posted May 7, 2021 Share Posted May 7, 2021 5 minutes ago, valve90210 said: I can certainly test it with a multimeter, but it' has 4 contacts so I'm not sure how best to test it. It is a lipo. I'll put up a pic when I get home later Does it have a fly lead like a balance cable? Black will be a common negative for all the cells, then each other lead will be a cell positive - any cell under 3v will likely be dead. Quote Link to comment Share on other sites More sharing options...
froggy8 Posted May 7, 2021 Share Posted May 7, 2021 my guess is the lipo is gone, the op has same controller as me and it does use a lipo. Quote Link to comment Share on other sites More sharing options...
walkbythesea Posted May 7, 2021 Share Posted May 7, 2021 4 minutes ago, froggy8 said: my guess is the lipo is gone, the op has same controller as me and it does use a lipo. Probably then, if not storage charged and still checked regularly it’s most likely dead 1 Quote Link to comment Share on other sites More sharing options...
froggy8 Posted May 7, 2021 Share Posted May 7, 2021 4 minutes ago, walkbythesea said: Probably then, if not storage charged and still checked regularly it’s most likely dead i have had mine nearly 10 years and still working. i dont charge that regurly either, i know you should as its a lipo but i havent and it still works. when the lipo is dead, i just put it on charge and then it works again. 1 Quote Link to comment Share on other sites More sharing options...
walkbythesea Posted May 7, 2021 Share Posted May 7, 2021 1 hour ago, froggy8 said: i have had mine nearly 10 years and still working. i dont charge that regurly either, i know you should as its a lipo but i havent and it still works. when the lipo is dead, i just put it on charge and then it works again. Nice one 👍 Seems to be such a mixed bag with lipo, some get lucky and some really don’t! 🥴 Quote Link to comment Share on other sites More sharing options...
bertberr Posted May 7, 2021 Share Posted May 7, 2021 The 'four' contacts are in fact just two, one 'pair' is +, the other pair - if its dead, just bridge the contacts on the Tx so you effectively have two rather than four, solder on a JST, and use any 700mah-1200mah 1s lipo 1 Quote Link to comment Share on other sites More sharing options...
walkbythesea Posted May 7, 2021 Share Posted May 7, 2021 24 minutes ago, bertberr said: The 'four' contacts are in fact just two, one 'pair' is +, the other pair - if its dead, just bridge the contacts on the Tx so you effectively have two rather than four, solder on a JST, and use any 700mah-1200mah 1s lipo Gosh, how very odd bertberr clearly knows more about this than me, do this 👆 1 Quote Link to comment Share on other sites More sharing options...
bertberr Posted May 7, 2021 Share Posted May 7, 2021 Quote Link to comment Share on other sites More sharing options...
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