LBRC
Posts: 124
Joined: 12/1/2006
From: , WA, USA
Status: offline
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Lipo’s are great just never leave them un-attended, always remember to unplug them when not in use, and toss them if they ever get puffy (pillow like). I have a couple of the Aero-nuts packs, they work great even if they are a bit of a tight squeeze but the price is certainly right. Too bad they don’t come with a Micro-T connector and the wires are a bit stiff and large, I replaced the wires in mine with some terrific low resistance thin wall silicone Doctor Motor slot-car motor wire, removing the balancing plug and wires but attaching a small thin and flexible balancing wire so that I can balance the cells if needed.
Since I mentioned balancing I suppose it deserves a bit of explanation; a 7.4v 2s LiPo has two 3.7v cells connected in series occasionally the two cells can become unbalanced, meaning one has a higher voltage/current level than the other, bad when charging and bad when discharging. Charging since LiPo’s charge to 4.2 volts per cell so 8.4 volts for a 2s pack that means with an unballanced pack one cell is being overcharged while one is not receiving a full charge, then when discharging the reverse happens so that the not fully charged cell can be discharged bellow a safe 3 volts per cell. 2 x bad and it can get worse during every charge/discharge cycle, especially if you don’t remove your pack from the car when charging and never notice the danger signs i.e. a hot or after it’s too late puffy/pillow like pack. Ideally a good pack will never become unbalanced but s*** happens, so with a third wire at the + to – connection you can monitor the pack by reading the voltage across each cell and charge them separately or in the case of a balancing charger/adapter as a parallel pack.
Not necessarily cheep but I highly recommend investing in a good charger with a voltage display and internal safety circuitry from a mainstream hobby supplier, and by that I mean a multi-battery type computerized charger like the Intellipeak Ice or Triton, not even any of the Ice or Triton knockoffs, and then of course to read the directions. Unfortunately at around $125 they tend to be a bit of an investment but if you stay interested in RC they pay for themselves in the long run. Or at the very least get a small digital multimeter but prefferably both.
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