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This invention describes a system that combines two different types of rechargeable batteries, such as a lithium-ion battery and a lead-acid battery. They are wired together to share power among themselves and with external devices, with a controller specifically designed to protect the more sensitive battery from damage or overload, even if the other battery takes the hit. The claims specifically focus on a lithium-ion battery being protected while a lead-acid battery is allowed to be stressed.
Why it matters: Filed before significant advancements in power electronics and battery management system algorithms. These developments now make the complex, real-time energy current control required for such a hybrid system more feasible and efficient.
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