Forum

Problem with Skysport 4 transmitter TV4F

Hi John, " Due to the fact that we don't charge these often, is this one of the reasons that the cells are prone to deteriorating?" Fraid so John 🤔 I'm sure we have all had this problem some time or other. Not sure what you mean by 'slow drain' but I'm assuming that your TX batteries are NiMh. have an irritating habit of self discharging at a rate of about 1% of capacity per day. So if we ignore them for 3 months or so they will go flat or even into so called Deep Discharge with cell voltages of 1V or less. At this point chemical changes take place which are irreversible and create a higher resistance in the cell. The chemical change prevents it from taking charge properly and what it does take is quickly dissipated in the increased cell internal resistance when placed under load. So the cell voltage collapses ☹️ NiMh cells should not be discharged below 1.1V. If they haven't been used for a while it is recommended to cycle them through 2 or 3 discharge-charge cycles to 'recondition' them. This helps to reduce the infamous Memory Effect as well. This procedure is also recommended to condition new batteries. Any half decent modern charger should include this cycling function. Glad to hear things seem to be working now 👍 Look forward to the Sunday trials report. Cheers, Doug 👍

5 years ago by RNinMunich

Forum

Battery backup

Think they only go from 2.6/8 v/cell to 3.8v Doug. Have some which are for REC bat voltage warning but they are only for 4,8v/6v low amp. I plugged one into my TGY 6x TX (runs on 4.8/6v) which I am using in,(for a boat TX) and it worked ok on that as a display There must be others for higher output somewhere, I'll have a search around. Evening all, (or morning here in my case) John B P.S we'll have to convert them to LiPos Doug!

5 years ago by jbkiwi

Forum

Charge multiple 7.2v

looking for the best way to charge multiple 7.2v at one time without having to buy a chargers for each battery. (trickle charge). right now I have (6) 7.2v and (5) 8.4v (4) 6v batteries. to get charged after a days playing. - Venom brand, deens connectors - scale ships - AMYA sailboats

5 years ago by tgilchristjr