7.2 Volt Field Charger (pdf)
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The unit is novel as it’s display graph shows you the time the battery has been charging in 2 minute intervals up to 16 minutes when finished. The “power” led indicates source voltage as it dims, and goes out at 11 vdc, this is needed because the unit draws 20 amps fully charging 4 batteries as you will need to run your engine or you will walk home!!
Read more Source:
http://www.uoguelph.ca/~antoon/circ/7.2V-Charger.pdf
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