Chris North 3 Posted October 30, 2019 Share Posted October 30, 2019 Hello - I have a 4 cell 2000mAh NIMh battery in my 10J transmitter that came when I bought it a number of years ago. For various reasons I have not used the transmitted for around 2 years and now the battery is discharging very quickly. I am using the transmitter on my simulator to get the fingers and thumbs back in action but the transmitter battery only lasts about an hour before I get a low voltage alarm. I have tried charging the battery with the battery charger on the NIMh setting at 2A (=1C). It charges to full in around 10 mins and then discharges very quickly once back in the transmitter. My question is is this pack dead or can it be resurrected? if so how do I go about doing this? Alternatively can I use a lipo as an alternative to the MIMh Tx battery pack and if so what would be a suitable size? Appreciate any advice Quote Link to comment Share on other sites More sharing options...
cymaz Posted October 30, 2019 Share Posted October 30, 2019 Sounds like a cell has died. Lipo batteries usually come as 3.7v, 7.4, 11.1 If it were me, I would get a proper eneloop battery. Mine has lasted for years. Quote Link to comment Share on other sites More sharing options...
CARPERFECT Posted October 30, 2019 Share Posted October 30, 2019 Battery dead, new one required, there is no Lipo available to fit the 10j, but Hobby King do a Life battery, had one in mine for 4 years now, with no problem. But you need to make sure your charger will charge Life Batteries, The Hobby King one is Turnigy Nano Teck 6.6 v Transmitter pack £12.24 SKU number 9210000039, or their 4.8v NiMH LSD. AT £5.45 SKU Number 9985000002-0. But your local model shop will stock this one Quote Link to comment Share on other sites More sharing options...
Jesus Cardin Posted October 30, 2019 Share Posted October 30, 2019 Chris, you have an original Futaba Li-Fe battery plus charger from Ripmax: http://www.ripmax.com/Item.aspx?ItemID=P-FT2F2100B http://www.ripmax.com/Item.aspx?ItemID=P-LBC-35D/UK In Spain, Futaba distributor offers a 2S 2.800mAh Li-Po battery and corresponding charger. This battery includes some circuits that controls charge, balance and over discharge protection: http://www.todohobby.net/es/accesorios-varios-emisoras/35668-bateria-lipo-tx-para-futaba-2800mah-74v-maxpro-.html http://www.todohobby.net/es/accesorios-varios-emisoras/35669-cargador-para-lipo-tx2800-maxpro.html Best Regards Jesus Edited By Jesus Cardin on 30/10/2019 07:56:41 Quote Link to comment Share on other sites More sharing options...
ken anderson. Posted October 30, 2019 Share Posted October 30, 2019 hello Chris ...for piece of mind I would sling the battery and lash out on a new one......plenty of good recommendations above... ken anderson...ne..1..lashing out dept. Quote Link to comment Share on other sites More sharing options...
Chris North 3 Posted October 31, 2019 Author Share Posted October 31, 2019 Thanks for the feedback. Sounds as if new is the way to go! Quote Link to comment Share on other sites More sharing options...
Jon H Posted October 31, 2019 Share Posted October 31, 2019 Sounds to me like a false peak as 2 amps is too much for an AA cell equipped Nimh. discharge it to 4v and then charge it up at .5 amps. I suspect it will then work just fine. I have a 1200mah 4.8v nimh in my 8j and it lasts for weeks. I only ever charge it at 500-600mah and its no bother at all. Quote Link to comment Share on other sites More sharing options...
Peter Christy Posted October 31, 2019 Share Posted October 31, 2019 I'm inclined to agree with Jon. I usually charge 2000mAH Eneloops at 1A, for exactly the reasons Jon cites. NiMhs have a fairly shallow "peak" when fully charged, which can make it difficult to detect. Too little current risks the peak not being detected properly, too much may give a false peak indication. Its also worth giving NiMhs a trickle charge once in a while (say once a year or two years) as this will "balance" the pack. This reduces the risk of a false peak detect when one cell peaks before the others. But don't constantly trickle charge them, as this will result in them drying out through overcharging. Once a year or so is quite sufficient! -- Pete Quote Link to comment Share on other sites More sharing options...
Peter Christy Posted October 31, 2019 Share Posted October 31, 2019 P.S: Should have added, another vote for LiFe replacement, if the NiMhs really are broken! -- Pete Quote Link to comment Share on other sites More sharing options...
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