| Well, I've started building again (after a hiatus of several years spent
| skydiving). I see NiMH batteries in the hobby stores now.
| Are there any on-line articles on the care and feeding of NiMH
| batteries? Are they as reliable as NiCds? If I re-equip my models with
| NiMHs, will I need to buy a special charger? Etc.?
To expand on what the other poster posted about
They're perhaps a little less reliable than NiCds -- they don't last
quite as many cycles, and handle abuse less well. And their rate of
self-discharge is a good deal faster than that of NiCd. But the
increased capacity helps make up for it.
If you have a fast charger, it needs to be able to charge NiMH cells
-- not all can. Your slow wal-wart charger will work fine with them,
but will take longer to do a full charge -- if the battery has 3x the
capacity, like 600 mAh vs. 1800 mAh, a full charge will take 3x as
Oh, and you can't safely charge AA NiMH cells at more than 1 C.
NiMH cells are *perfect*
for your transmitter. The only downside is
not being able to quick charge at 2 C -- but having 2-3x the capacity
helps make up for that.
For a receiver pack, they're good, but there's a few gotchas -- they
have higher internal resistance, so they can't provide as much power.
Normally this isn't a problem, but if your servos draw a whole lot of
power (like with a stalled digital servo) it may be one. Cushioning
them against vibration is more important as well.
For a power pack, be aware that NiMH cells have higher resistance, so
they may not be able to dump as much power in a short time.
Doug McLaren, email@example.com
"A good reputation is one of many tiny annoyances to which I have
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