john stones 1 - Moderator Posted January 31, 2020 Share Posted January 31, 2020 Everytime I charge my TX it gives a full signal after a few minutes, nimh isn't fully charged, leave it a few minutes, then charges correctly. Why, what's happening ? charge rate 0.4 amp. Quote Link to comment Share on other sites More sharing options...
Denis Watkins Posted January 31, 2020 Share Posted January 31, 2020 0.4 amp charge rate is ok for a 400mah Nimh John Or, one tenth capacity of the actual nimh Voltage needs selection too Quote Link to comment Share on other sites More sharing options...
john stones 1 - Moderator Posted January 31, 2020 Author Share Posted January 31, 2020 It seems unhappy at higher rate Denis, voltage selects itself on nimh. Charge lead is light ish gauge, would this play a part, only happens on nimhs, lipos/life, no probs. Quote Link to comment Share on other sites More sharing options...
Denis Watkins Posted January 31, 2020 Share Posted January 31, 2020 If anything, Nimhs are light duty anyway, and if you look at their leads, they are not high discharge. If 1 cell is starting to drop now, maybe the lower voltage of the pack is triggering full ok momentarily Then with being boosted, then the charger believes that it can carry on, am guessing I do know a failing cell does mess up charging Is it All your Nihm packs do this? Quote Link to comment Share on other sites More sharing options...
john stones 1 - Moderator Posted January 31, 2020 Author Share Posted January 31, 2020 Yes, Nimhs are in good nick, doing it on flight packs as well, did it even on new packs and other chargers. Quote Link to comment Share on other sites More sharing options...
Former Member Posted January 31, 2020 Share Posted January 31, 2020 [This posting has been removed] Quote Link to comment Share on other sites More sharing options...
PatMc Posted January 31, 2020 Share Posted January 31, 2020 John, it sounds like you are describing a "false peak" detection. The only way to overcome this is to increase the charge current. I always use manual select charge rate, never the auto select charge but normally I use a limit of 1A charge for Tx & Rx nimhs which seems to work well even with quite high (2000 maH) batteries & doesn't cause the leads to heat up. Quote Link to comment Share on other sites More sharing options...
john stones 1 - Moderator Posted January 31, 2020 Author Share Posted January 31, 2020 I was charging at 1c and it was happening, kept reducing till it worked, 1800 in tx, flight packs 2500. Quote Link to comment Share on other sites More sharing options...
Former Member Posted January 31, 2020 Share Posted January 31, 2020 [This posting has been removed] Quote Link to comment Share on other sites More sharing options...
PatMc Posted January 31, 2020 Share Posted January 31, 2020 What charger are you using ? Does it have a separate setting for nicads & nimhs ? BTW if the flight batteries are AA cells then 2500 mAH is probably a too high capacity for reliability in models using more than 2 or 3 servos. Quote Link to comment Share on other sites More sharing options...
flight1 Posted January 31, 2020 Share Posted January 31, 2020 i find 400mah a good all round charging figger for nimh packs for Rx and TX's. When i have had false peak detect charging problems on two ocaisions it was a bad switch, another time a poor connector (all having slightly higher impedance than a good version and you also get problems when you have a doggy cell in the pack which has happened to me only with new or just about new packs. if you can get to each cell and test voltage if you have a doggy cell it will have a lower voltage than the others after a little use. To get at the ends of each battery without ripping the nice shring wrap I use small pins to pock through the insulation tto make contact with the terminals. Only last weekend a new member lost his trainer due to one cell failing and the anoying thing about it he was on finals and litery only needed 2/3 seconds of power and all would have been good (battery was checked on first flight and this was the second short flight) Quote Link to comment Share on other sites More sharing options...
john stones 1 - Moderator Posted January 31, 2020 Author Share Posted January 31, 2020 Posted by Steve J on 31/01/2020 16:45:58: What is your dV set to? What's that Steve ? Quote Link to comment Share on other sites More sharing options...
john stones 1 - Moderator Posted January 31, 2020 Author Share Posted January 31, 2020 Posted by PatMc on 31/01/2020 16:46:22: What charger are you using ? Does it have a separate setting for nicads & nimhs ? BTW if the flight batteries are AA cells then 2500 mAH is probably a too high capacity for reliability in models using more than 2 or 3 servos. HK Quatro Pat. Don't follow your second part ? Quote Link to comment Share on other sites More sharing options...
Former Member Posted January 31, 2020 Share Posted January 31, 2020 [This posting has been removed] Quote Link to comment Share on other sites More sharing options...
PatMc Posted January 31, 2020 Share Posted January 31, 2020 Posted by john stones 1 on 31/01/2020 16:57:02: Posted by PatMc on 31/01/2020 16:46:22: What charger are you using ? Does it have a separate setting for nicads & nimhs ? BTW if the flight batteries are AA cells then 2500 mAH is probably a too high capacity for reliability in models using more than 2 or 3 servos. HK Quatro Pat. Don't follow your second part ? Is there a charge setting option for nicads as well as one for nimhs ? Actually Steve's question covers the same point I was getting at. Edited By PatMc on 31/01/2020 17:17:55 Quote Link to comment Share on other sites More sharing options...
john stones 1 - Moderator Posted January 31, 2020 Author Share Posted January 31, 2020 yep, nimh or nicad. Quote Link to comment Share on other sites More sharing options...
Jon H Posted February 1, 2020 Share Posted February 1, 2020 i use 500-600mah on all my nimh's. works well Quote Link to comment Share on other sites More sharing options...
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