Re: Charging A Lead Acid Battery

Dave.H wrote:
How would I go about building a charger for a lead acid battery.
Jaycar Electronics sells a 5 amp hour 6 volt SLA battery for use in
flashlight lanterns, but as far as I can tell they don't sell the
charger.

Battery
http://www.jaycar.com.au/productResults.asp?FORM=KEYWORD
(CAT. NO. SB2498)

Thanks


Very simple charger:

-----
+9 ------Vin|LM317|Vout---+
----- |
Adj [2.5R]
| | 1N400x
+----------+---->|---+
| +
[Batt]
|
Gnd --------------------------------+

You need a 9 or 12 volt wall wart capable of
at least 500 mA, an LM317 chip, a heat sink for
the chip, and 2 5 ohm, 1 watt (at least) resistors
in parallel to make the 2.5 ohm resistance, and
a 1N400x diode. Charge for 12-14 hours.

Ed
.

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