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Old 12-19-2012
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Re: Battery Sizing - am I crazy?

Originally Posted by hellosailor View Post
"Maintenance free" is usually a dirty word. It means a wet lead battery, which will need to have the electrolyte topped up for best life, but with the cells conveniently sealed up so they can't spill and you can never add the electrolyte when needed.
It was a clever idea in the 70's but now, I think everyone would agree that either you want a battery that can be maintained (i.e. plain wet lead) or one that in theory never actually needs topping up (AGM or gel or Lithium, truly "sealed valve regulated").
I assumes the cells could be topped off by opening the caps on top, I didn't open them in the store but every lead acid battery I've bought had something similar to top off the electrolyte. But now that u mention it it does say maintenance free... Im confused...

I would love some agm batteries, but the only brand I find locally in auto shops etc is optima, which are known to be great batteries but just way overpriced, $4 per amp hour more or less... if anyone knows a good brand of agms and where to get them let me know, but shipping costs generally preclude internet ordering or else I'd have two trojan 6 volts and never worry about it again lol
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Old 12-20-2012
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Re: Battery Sizing - am I crazy?

The "maintenance free" caps are often welded or otherwise secured down. There may be extra electrolyte, etc. to compensate a bit but the whole idea was "we can make it good enough so you never have to add water". Mainly for the crowd who find tire pressure and oil are also things too messy to do themselves.

Your local stores do carry falt-plate AGM batteries, from all the leading makers. They're almost impossible to spot even if they are on the shelf, but you can always as the clerk, or go right to the local battery distributor. Of course AGM isn't perfect either but that's a whole other debate. They'll be priced about halfway between the Optima and conentional wet lead.

Or of course you can stay with the MF battery and just make sure it needs replacement inside the warranty period. (G)
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