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I have a 6v lead acid battery it is fully discharged from 6 months and shows the voltage 5.3 V(3 cell). I have wall power adapter of 12v. When i directly try to charge current reached to 1.8A and battery says peakup current of 1.35A.

So this directly charging by 12v/1.8A is safe for battery if i just want to charge 50%?

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    \$\begingroup\$ Several problems. Does your wall power adapter have a (constant) current limit? If not it will not be happy with being clamped down to 5.3 V. Next potential problem is your battery. Can it take 1.8 A charge current? How will you terminate the charge without boiling the battery? Get yourself a 6 V lead-acid charger! \$\endgroup\$ – winny Jan 5 '17 at 9:02
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    \$\begingroup\$ Try and do a little research into the care and feeding of lead acid batteries a good article here batteryuniversity.com/learn/article/… \$\endgroup\$ – RoyC Jan 5 '17 at 9:14
  • \$\begingroup\$ So this directly charging by 12v/1.8A is safe for battery if i just want to charge 50%? NO you must use a proper lead acid battery charger suitable for 6 V batteries. Also forget about charging to 50% as there is no easy way to determine how much charge the battery has taken. Just charge to 100%. \$\endgroup\$ – Bimpelrekkie Jan 5 '17 at 9:40
  • \$\begingroup\$ I have a left hand drive car that I want to use in England, can I still drive on the right hand side? \$\endgroup\$ – Andy aka Jan 5 '17 at 9:58
  • \$\begingroup\$ @Andy - yes, as long as you drive in reverse. \$\endgroup\$ – Russell McMahon Jan 5 '17 at 10:49

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