You probably already know but,
FYI, 4 amp-hour 12v can be done with 10 NiMh sub C cells.
I charge them until uniformly hot with a discarded laptop power
supply brick. Laptop supplies operate fine even when shorted as they
are current limiting, mine is 2.2 amp, 18 volt.
For charging them off a car battery I use a car tail light bulb in
series with the batteries as a current limiter. A 10 watt light bulb
changes brightness with current draw but can never pull more than 1.5
amps at 15 volts.
With NiMh you just do not want to exceed a charge rate over the total
current rating. All the magic in exspensive chargers accomplish is
making it so you do not have to watch your batteries while you
charge. Kind a like a automatic bread machine vs baking in an oven.
Rich Peet
--- In "Dr. Bruce Wilson"
<> wrote:
> --- In "qukza" <> wrote:
...
I use a 4 amp-hour 12v lead acid battery for power.
> Limits portability (the battery needs it's own fanny pack), but I
> can record for days with a fully-charged battery.
...
> Bruce
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