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<blockquote data-quote="shizzzon" data-source="post: 7448792" data-attributes="member: 590338">regardless of how close their specs are, it is never the right thing to do!If you want to do this practice anyway instead of going with the same type of battery, you will need to invest in a good AGM battery charger.Sears sells their own, DieHard Platinum chargers are very good for all AGM batteries that are 12v rated.You will need to monitor and check resting voltage on all batteries separately about once a week and charge when necessary.Anything below 12.7v needs to be put on charge individually regardless of how strong your alternator is.You may also need to load test your batteries if you suspect consistent low rest voltage when checking condition.Failure to do this, you will lose your electrical system down the road.If you do not lose it, your entire battery bank wil not function as if you had 3 batteries in there...but far less.It&#039;s a fact, not an opinion.This is why it&#039;s best to match everything... Otherwise, a good Solenoid from Oznium will at least isolate via internl relay different batts when car is off.</blockquote>

[QUOTE="shizzzon, post: 7448792, member: 590338"] regardless of how close their specs are, it is never the right thing to do! If you want to do this practice anyway instead of going with the same type of battery, you will need to invest in a good AGM battery charger. Sears sells their own, DieHard Platinum chargers are very good for all AGM batteries that are 12v rated. You will need to monitor and check resting voltage on all batteries separately about once a week and charge when necessary. Anything below 12.7v needs to be put on charge individually regardless of how strong your alternator is. You may also need to load test your batteries if you suspect consistent low rest voltage when checking condition. Failure to do this, you will lose your electrical system down the road. If you do not lose it, your entire battery bank wil not function as if you had 3 batteries in there...but far less. It's a fact, not an opinion. This is why it's best to match everything... Otherwise, a good Solenoid from Oznium will at least isolate via internl relay different batts when car is off. [/QUOTE]

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