Noggin Posted August 22, 2019 Report Share Posted August 22, 2019 After 7 years, my Numax domestic batteries have finally given up - just got home & intend to order 3 more - checked original boat specs - state 3 x 120AH batteries, but I'm pretty sure that those currently on board are 135AH - I can't check as the boat is 80 miles away- silly question, but will there be a problem just buying 135AH's anyway? - electrics are a mystery to me Link to comment Share on other sites More sharing options...
Jen-in-Wellies Posted August 22, 2019 Report Share Posted August 22, 2019 Physical size is important. Length, width and height. For the boat safety scheme they need to be restrained from moving around and depending on how this is done on your boat, buying the wrong size may require some alterations. Better.to measure and check before buying. It may be the extra capacity in the 135Ahr batts are gained by more efficient use internal construction, or just in the height, but how do you know without measuring the originals? Jen 1 Link to comment Share on other sites More sharing options...
Tony Brooks Posted August 22, 2019 Report Share Posted August 22, 2019 If they are the same physical size with the same terminal layout then as long as you are on top of your charging regime (which you are if you got 7 years out of the lasts set) I can't see that you will notice much difference at all. 7 years life tells me you keep them well charged and never deeply discharge them so you probably had more capacity than you needed. 1 Link to comment Share on other sites More sharing options...
Chewbacka Posted August 22, 2019 Report Share Posted August 22, 2019 As already said a different shape battery (a bit longer or wider etc) may not fit in your battery box, but also the battery posts can be in different positions, so if your battery cables are a bit tight, they may not reach the posts. Link to comment Share on other sites More sharing options...
BruceinSanity Posted August 22, 2019 Report Share Posted August 22, 2019 Can I ask a related question to this? Checking out my options for a replacement start battery recently, some of them are described by three numbers or a pair of same such as 643/644. Do these relate to the size of the case and orientation of the terminal posts? Link to comment Share on other sites More sharing options...
Chewbacka Posted August 22, 2019 Report Share Posted August 22, 2019 40 minutes ago, BruceinSanity said: Can I ask a related question to this? Checking out my options for a replacement start battery recently, some of them are described by three numbers or a pair of same such as 643/644. Do these relate to the size of the case and orientation of the terminal posts? I think so. The alpha batteries site is good for dimensions etc. https://www.alpha-batteries.co.uk/catalogsearch/result/?q=643 however I did not buy my last set from them, found a better offer price elsewhere Link to comment Share on other sites More sharing options...
WotEver Posted August 22, 2019 Report Share Posted August 22, 2019 44 minutes ago, BruceinSanity said: Can I ask a related question to this? Checking out my options for a replacement start battery recently, some of them are described by three numbers or a pair of same such as 643/644. Do these relate to the size of the case and orientation of the terminal posts? Yes Link to comment Share on other sites More sharing options...
BruceinSanity Posted August 22, 2019 Report Share Posted August 22, 2019 2 hours ago, Chewbacka said: I think so. The alpha batteries site is good for dimensions etc. https://www.alpha-batteries.co.uk/catalogsearch/result/?q=643 however I did not buy my last set from them, found a better offer price elsewhere 2 hours ago, WotEver said: Yes Thanks for that. Wouldn’t it be nice if all batteries were labelled with that code, would simplify the situation and avoid having to grovel around trying to measure up the old one in situ. Link to comment Share on other sites More sharing options...
Alan de Enfield Posted August 22, 2019 Report Share Posted August 22, 2019 5 minutes ago, BruceinSanity said: Thanks for that. Wouldn’t it be nice if all batteries were labelled with that code, would simplify the situation and avoid having to grovel around trying to measure up the old one in situ. I always thought that were all marked. Mine are 625's. I believe it comes from 'industrial /agricultural' usage, but all batteries are now coded. Complete list here : https://www.manbat.co.uk/wp-content/themes/manbat/pos/numax_2012.pdf Link to comment Share on other sites More sharing options...
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