Quote:
Originally Posted by airbus02
I'm not sure what you mean by "You can only replace an actually dead battery"
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A really dead Lithium cell can't be recharged, only replaced.
A "flat" battery is one that charges. Calling a battery of any technology "dead" implies it won't take a charge.
1) Trying hard to charge a dead lead acid cell may simply produce oxygen and hydrogen. Same is the case with continuing to charge a fully charged lead acid.
2) Dead NiCd or NiMH cells may get slightly warm at recommended trickle charge. A high power rapid charger needs to detect this or the battery will rupture.
3) Force charging a dead Lithium cell directly (used in laptops, tablets, phones, ereaders and some tools) may cause it to burn explosively and violently. The built in chargers or external chargers for removable/interchangeable packs will not force charge; usually a warning LED flashes or a fault symbol is displayed.
There are other less common rechargeable batteries based on silver, sulphur or iron. I don't know much about them.