{"id":1209,"date":"2025-03-27T13:26:06","date_gmt":"2025-03-27T12:26:06","guid":{"rendered":"https:\/\/dev-site.se\/sutars.com\/?page_id=1209"},"modified":"2025-09-25T12:43:58","modified_gmt":"2025-09-25T10:43:58","slug":"faq-lead-acid-batteries","status":"publish","type":"page","link":"https:\/\/sutars.com\/en\/faq-lead-acid-batteries\/","title":{"rendered":"FAQ Lead-acid batteries"},"content":{"rendered":"\t\t
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FAQ Lead-acid batteries<\/h1>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t
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Frequently asked questions about lead-acid batteries<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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What happens when batteries discharge each other? How deeply can you discharge without damaging them? On this page, we’ve gathered answers to the most common questions about lead-acid batteries in boats – from charging susceptibility to lifespan, peak charging and how to avoid unnecessary wear and tear. Perfect for those who want to understand more and take care of their batteries properly.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t

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What is chargeability? <\/div><\/span>\n\t\t\t\t\t\t\t\n\t\t\t<\/i><\/span>\n\t\t\t<\/i><\/span>\n\t\t<\/span>\n\n\t\t\t\t\t\t<\/summary>\n\t\t\t\t
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It is a measure of how well the batteries receive power. Larger battery banks give higher charge receptivity. Older batteries have lower receptivity.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/details>\n\t\t\t\t\t\t

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Will my batteries discharge each other? <\/div><\/span>\n\t\t\t\t\t\t\t\n\t\t\t<\/i><\/span>\n\t\t\t<\/i><\/span>\n\t\t<\/span>\n\n\t\t\t\t\t\t<\/summary>\n\t\t\t\t
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No, as long as you have healthy batteries, only small currents will flow, the effect of which takes a very long time. However, a defective battery will also drain the healthy batteries in the same circuit, and eventually damage them.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/details>\n\t\t\t\t\t\t

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Do the auxiliary batteries discharge the starter battery when I start the engine? <\/div><\/span>\n\t\t\t\t\t\t\t\n\t\t\t<\/i><\/span>\n\t\t\t<\/i><\/span>\n\t\t<\/span>\n\n\t\t\t\t\t\t<\/summary>\n\t\t\t\t
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No, the starter motor lowers the voltage more than the discharged batteries and will suck all the power. If you have a diesel that needs to be glowed, there will be a small current from the starter battery to the consumer bank for a few seconds, but it will never be over 1 Ah.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/details>\n\t\t\t\t\t\t

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How long do my lead-acid batteries last? <\/div><\/span>\n\t\t\t\t\t\t\t\n\t\t\t<\/i><\/span>\n\t\t\t<\/i><\/span>\n\t\t<\/span>\n\n\t\t\t\t\t\t<\/summary>\n\t\t\t\t
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After three years, many have only half of their battery capacity left. Then it may be time to change.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/details>\n\t\t\t\t\t\t

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Can I increase the life of my lead-acid batteries? <\/div><\/span>\n\t\t\t\t\t\t\t\n\t\t\t<\/i><\/span>\n\t\t\t<\/i><\/span>\n\t\t<\/span>\n\n\t\t\t\t\t\t<\/summary>\n\t\t\t\t
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Yes, it does. Extending the battery bank increases charge receptivity and reduces deep discharge, which reduces wear on lead-acid batteries. Handling them when not in use also affects their lifetime.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/details>\n\t\t\t\t\t\t

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How deeply can I discharge lead-acid batteries? <\/div><\/span>\n\t\t\t\t\t\t\t\n\t\t\t<\/i><\/span>\n\t\t\t<\/i><\/span>\n\t\t<\/span>\n\n\t\t\t\t\t\t<\/summary>\n\t\t\t\t
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To avoid drastically shortening the life of your lead-acid batteries, marine and leisure batteries should rarely be discharged to 50 per cent. In normal use, you should ideally stay above 70-75 per cent of the battery’s capacity. Gel and AGM batteries are more durable.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/details>\n\t\t\t\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

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Can my lead-acid batteries be overcharged? <\/div><\/span>\n\t\t\t\t\t\t\t\n\t\t\t<\/i><\/span>\n\t\t\t<\/i><\/span>\n\t\t<\/span>\n\n\t\t\t\t\t\t<\/summary>\n\t\t\t\t
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If charging continues for a number of hours at 14.4 V, lead-acid batteries become overcharged. In the past, lead batteries gassed a lot. Nowadays, much of the gassing in lead batteries has been removed. Therefore, few boats run on the engine for so long that gassing becomes a problem.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/details>\n\t\t\t\t\t\t

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What is the capacity of my lead-acid batteries? <\/div><\/span>\n\t\t\t\t\t\t\t\n\t\t\t<\/i><\/span>\n\t\t\t<\/i><\/span>\n\t\t<\/span>\n\n\t\t\t\t\t\t<\/summary>\n\t\t\t\t
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You cannot find out how much electricity your lead-acid batteries really contain when they are fully charged by measuring the voltage. If your lead-acid batteries have lost capacity, you can find out by carrying out a load test<\/a>.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/details>\n\t\t\t\t\t\t

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Is it good to top up your batteries? <\/div><\/span>\n\t\t\t\t\t\t\t\n\t\t\t<\/i><\/span>\n\t\t\t<\/i><\/span>\n\t\t<\/span>\n\n\t\t\t\t\t\t<\/summary>\n\t\t\t\t
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Yes, because the durability of the batteries increases if they are top-charged occasionally. A solar panel can last for weeks while the boat is not in use.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/details>\n\t\t\t\t\t\t

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Can a mains charger top up the batteries? <\/div><\/span>\n\t\t\t\t\t\t\t\n\t\t\t<\/i><\/span>\n\t\t\t<\/i><\/span>\n\t\t<\/span>\n\n\t\t\t\t\t\t<\/summary>\n\t\t\t\t
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Of course, but the disadvantage is that you have to run cables across the docks and look for electrical outlets. It’s easier with a solar panel.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/details>\n\t\t\t\t\t\t

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Can a mains charger cause galvanic corrosion? <\/div><\/span>\n\t\t\t\t\t\t\t\n\t\t\t<\/i><\/span>\n\t\t\t<\/i><\/span>\n\t\t<\/span>\n\n\t\t\t\t\t\t<\/summary>\n\t\t\t\t
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Yes, if land soil is not separated from soil in the boat.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/details>\n\t\t\t\t\t\t

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Which charger should I choose for my batteries? <\/div><\/span>\n\t\t\t\t\t\t\t\n\t\t\t<\/i><\/span>\n\t\t\t<\/i><\/span>\n\t\t<\/span>\n\n\t\t\t\t\t\t<\/summary>\n\t\t\t\t
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Avoid old transformer chargers and opt for a modern charger instead. Large chargers charge faster than small ones, but are more expensive. However, you rarely need a charger that can handle more than 10 amps.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/details>\n\t\t\t\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t","protected":false},"excerpt":{"rendered":"

Frequently asked questions about lead-acid batteries What happens when batteries discharge each other? How deeply can you discharge without damaging them? On this page, we’ve gathered answers to the most common questions about lead-acid batteries in boats – from charging susceptibility to lifespan, peak charging and how to avoid unnecessary wear and tear. Perfect for […]<\/p>\n","protected":false},"author":3,"featured_media":0,"parent":0,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"_acf_changed":false,"_seopress_robots_primary_cat":"","_seopress_titles_title":"FAQs on lead-acid batteries | Sutars","_seopress_titles_desc":"Here you will find frequently asked questions about lead-acid batteries, so you can take care of your batteries properly. Can't find what you're looking for? Get in touch with us!","_seopress_robots_index":"","editor_notices":[],"footnotes":""},"Pagecategories":[60],"class_list":{"0":"post-1209","1":"page","2":"type-page","3":"status-publish","5":"Pagecategories-batterierna"},"acf":[],"meta_box":[],"_links":{"self":[{"href":"https:\/\/sutars.com\/en\/wp-json\/wp\/v2\/pages\/1209","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/sutars.com\/en\/wp-json\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/sutars.com\/en\/wp-json\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/sutars.com\/en\/wp-json\/wp\/v2\/users\/3"}],"replies":[{"embeddable":true,"href":"https:\/\/sutars.com\/en\/wp-json\/wp\/v2\/comments?post=1209"}],"version-history":[{"count":6,"href":"https:\/\/sutars.com\/en\/wp-json\/wp\/v2\/pages\/1209\/revisions"}],"predecessor-version":[{"id":13512,"href":"https:\/\/sutars.com\/en\/wp-json\/wp\/v2\/pages\/1209\/revisions\/13512"}],"wp:attachment":[{"href":"https:\/\/sutars.com\/en\/wp-json\/wp\/v2\/media?parent=1209"}],"wp:term":[{"taxonomy":"Pagecategories","embeddable":true,"href":"https:\/\/sutars.com\/en\/wp-json\/wp\/v2\/Pagecategories?post=1209"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}