voltwatch question
The reason the Voltwatch is not recommended for NiMh batteries is because of the way they discharge at the end of a cycle. A NiCd tends to taper off at the end of a charge, whereas a NiMh battery drops off much more rapidly. So, if you have a Voltwatch on a NiMh battery it may show a good charge when you take off, giving you a false sense of security even though it is near the end of it's charge. Then you'll be flying along all happy and suddenly your battery goes dead.