Neddy Posted March 10 Share Posted March 10 Just wondering if it safe to use two 3.7v 1860 lithium batteries to make up 7.4 volts to run 5 volt components eg servos, stabilisers and receivers. Quote Link to comment Share on other sites More sharing options...
Martin Harris - Moderator Posted March 10 Share Posted March 10 I assume you’re referring to 18650 size cells? Remember that the voltage quoted is a nominal figure and depending on the type of chemistry, will typically be around 4 - 4.2V (8 - 8.4V per 2S pack) fully charged. There are high voltage servos and many receivers are tolerant of such voltage but most servos are likely to have short lives run without a regulated supply. 1 Quote Link to comment Share on other sites More sharing options...
Engine Doctor Posted March 10 Share Posted March 10 As Martin suggest use a regulator if i doubt about servos or reciever. 18650 Li-ion cells are the same voltage as lipos ànd = 8.v fully charged HV servos and rxs will be ok , others will quickly let the magic smoke out. Quote Link to comment Share on other sites More sharing options...
Phil Green Posted March 10 Share Posted March 10 18650 is only a size measurement, LiFePo4 cells are available in 18650 format, a 2S is 7.2v charge, nominal 6.6v, still considered 'HV' but not as 'H' as lion or lipo 🙂 1 Quote Link to comment Share on other sites More sharing options...
Wookman Posted March 11 Share Posted March 11 22 hours ago, Neddy said: Just wondering if it safe to use two 3.7v 1860 lithium batteries to make up 7.4 volts to run 5 volt components eg servos, stabilisers and receivers. NO. Unless you use a Battery eliminator circuit (BEC) or High Voltage (HV) rx and servos. 1 Quote Link to comment Share on other sites More sharing options...
Neddy Posted March 11 Author Share Posted March 11 Would connecting a low amp ESC do the job. Quote Link to comment Share on other sites More sharing options...
Dickw Posted March 11 Share Posted March 11 1 hour ago, Neddy said: Would connecting a low amp ESC do the job. With care you could use the BEC in an ESC, but a more sensible option would be to get a separate BEC (voltage regulator). Dick Quote Link to comment Share on other sites More sharing options...
Cuban8 Posted March 12 Share Posted March 12 (edited) I can recommend the etronix stand alone BECs that are available in either 5V or 6V versions at 5A. Usually around the eight quid mark from most model shops if you do a web search. I've had one in my Durafly Vampire since new (eight years+) when the original HK unit failed during bench setup and thankfully before the model's first flight. Edited March 12 by Cuban8 Quote Link to comment Share on other sites More sharing options...
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.
Note: Your post will require moderator approval before it will be visible.