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Model Forum / Radio Controlled / Air Models / September 2006Tx-Rx Ni Cd recharging/Good Practice?
Back at base I leave both switched on for about 60 minutes to drain a little, then using a simple 2 pin Hitec Tx-Rx charger , charge for not less than 12 hours. The 230v charger gets quite warm in the process as you might expect, but I then have sufficient charge for a further 3x15-20 minute flights. However my cordless vacuum cleaner stays on constant charge when not in use, perhaps I should just leave my flying kit plugged in between flying days? 2nd question NiMH batteries as cost effective replacement? Advice welcome. P > Back at base I leave both switched on for about 60 minutes to drain a > little, then using a simple 2 pin Hitec Tx-Rx charger , charge for not [quoted text clipped - 10 lines] > Advice welcome. > P I think the genral advice is constant topping up isn't good practise for NiCds. I use a propeak prodigy to do all my charging and discharging. My packs are about 800mAh. I generally get 3 10 minute flights and then discharge and full charge every 2nd week. Depends on pack rating and usage obviously. NiMHs usually have higher ratings for about the same price, so certainly worth buying. Just make sure you have a charger that can work with them. Ni-Mh does not have as long a service (cycle) life as Ni-Cds and their capacity tends to fade with use, unlike Ni-Cd that usually stay above 80% of rated until they are ready to go Tango Uniform. They are less tolerant of fast charge and overcharge than Ni-Cds also.  SignatureRed S. Red's R/C Battery Clinic http://www.rcbatteryclinic.com Check us out for "revolting" information. >> Back at base I leave both switched on for about 60 minutes to drain a >> little, then using a simple 2 pin Hitec Tx-Rx charger , charge for not [quoted text clipped - 18 lines] > NiMHs usually have higher ratings for about the same price, so certainly > worth buying. Just make sure you have a charger that can work with them. I believe you can still use the standard charger to charge Ni-Mh so if replaced the outlay would not have to include another charger at least. > Ni-Mh does not have as long a service (cycle) life as Ni-Cds and their > capacity tends to fade with use, unlike Ni-Cd that usually stay above 80% [quoted text clipped - 23 lines] >> NiMHs usually have higher ratings for about the same price, so certainly >> worth buying. Just make sure you have a charger that can work with them. Oops.. the thread has opened up again! After 4 flights last evening, lured on by swept cirrus against a crimson sunset and not a breath of wind, My 4.8v RX NiCd (700mah) became quite tired. Suddenly I could not achieve full throttle, and other responses became a little sluggish. All this was disguised by the racket of other club members running up their noisy 4 strokes in the pits, and I was lucky not to hit a gravity hole! The decision has now been made for me and I have bought a new set of 2,500mah NiMHs ( TX & RX) all for less than £20 on eBay. Using my standard 55/65ma charger this means 2 days to full charge, but usually just 1 day for a top up, and many more than 4 flights/session before problems arise. ( hope my sums are right!) Thanks P >I believe you can still use the standard charger to charge Ni-Mh so if >replaced the outlay would not have to include another charger at least. [quoted text clipped - 18 lines] >>>> Advice welcome. >>>> P You are wasting your time leaving your system switched on and could risk damaging the packs if they happen to get low enough to drive one or more cells into reverse. I have heard that doing this with the Tx antenna collapsed can damage the output final of the transmitter by overheating. Something about a missmatch when the antenna is not fully extended. RF experts can explain this one to you. Your cordless vacuum cleaner isn't going to cost you significant bucks if the battery stops working either. For kicks, take your cordless vac off the charger and run it down, let it set for a week and odds are that one or more of the cells will have shorted due to advance separator deterioration from continuous overcharge. SignatureRed S. Red's R/C Battery Clinic http://www.rcbatteryclinic.com Check us out for "revolting" information. > Back at base I leave both switched on for about 60 minutes to drain a > little, then using a simple 2 pin Hitec Tx-Rx charger , charge for not [quoted text clipped - 10 lines] > Advice welcome. > P > Red's R/C Battery Clinic > http://www.rcbatteryclinic.com > Check us out for "revolting" information. Thanks Red everything I ever needed to know. Now shared with the rest of our flying club. Cheers P |
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