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<blockquote data-quote="ACEngineering" data-source="post: 8126646" data-attributes="member: 13308"><img class="smilie smilie--emoji" loading="lazy" alt="🤷‍♂️" title="Man shrugging&nbsp; &nbsp; :man_shrugging:" src="https://cdn.jsdelivr.net/joypixels/assets/6.5/png/unicode/64/1f937-2642.png" data-shortname=":man_shrugging:" /> try a different charger, if you dont have one then you certainly want to buy the rapid charger anyway.grinder wont damage the batteries but it will flatten them quicker than most tools.i have too very old 4 amp batteries and they work fine, all mine get used on the grinder 4amp, 5amp and the 9amp. i use what ever needs making flat first so it can be fully recharged, not a fan of leaving batteries flat or part charged any longer than necessary, the only exception to this is my remote control car batteries that are lipo's which you always want to put in to storage charge after use as leaving flat will damage them just as much as leaving them fully charged, also the fire risk of leaving fully charged is much greater.</blockquote>

[QUOTE="ACEngineering, post: 8126646, member: 13308"] 🤷‍♂️ try a different charger, if you dont have one then you certainly want to buy the rapid charger anyway. grinder wont damage the batteries but it will flatten them quicker than most tools. i have too very old 4 amp batteries and they work fine, all mine get used on the grinder 4amp, 5amp and the 9amp. i use what ever needs making flat first so it can be fully recharged, not a fan of leaving batteries flat or part charged any longer than necessary, the only exception to this is my remote control car batteries that are lipo's which you always want to put in to storage charge after use as leaving flat will damage them just as much as leaving them fully charged, also the fire risk of leaving fully charged is much greater. [/QUOTE]

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