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Keven:
On the battery, let me make a suggestion: always let a NiCad drain down to zero or near-zero charge before recharging. Otherwise, it develops "memory" and eventually can only hold a charge equal to the one it's been used to before recharging.
The problem with following this advice is that sometimes you go on a flight with a low-charge battery, which can get you in trouble if all of a sudden you need the unit for an extended period. The solution is either to use Nickel Metal Hydride or Lithium batteries (which don't develop "memory", so can be recharged after every use) or have a holder with alkaline batteries backing up your NiCad's.
Ernie
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