Vaughn wrote, On 1/7/2014 6:11 AM:

Hint: Because the capacity of a battery decreases over time, one symptom
of a bad battery you might notice is that it takes a charge much quicker
than a good one.

A weak battery, unless it was run completely flat, will take just as
long to charge as good battery that was discharged the same amount. You
have to replace the amp hours you took out, regardless of the capacity
of the battery.

What tells you your battery has lost capacity is it won't power your
instruments as long as it used to, or the voltage is significantly lower
after a flight than when it was new. You can also do a discharge test to
determine the capacity, using a resistance and a voltmeter (cheap), or a
device designed to do it automatically ($50-$150 range for that).

Regardless, considering the low cost of a decent 800 ma charger, I'd go
the "one charger per battery" route.

--
Eric Greenwell - Washington State, USA (change ".netto" to ".us" to
email me)