Ersatz-Laptop-Akku für Dell Inspiron 17R-SE-4720 Serie M5Y0X 11,1V 97Wh 9-Zellen Li-Ionen Neu

Cell Type: Li-ion and Li-Polymer charge faster and hold far more energy than the older NiMH packs.
Voltage: the same laptop model can take 11.1 V or 14.8 V, and those are not interchangeable.
Capacity: higher capacity runs longer, but it is bulkier, heavier and costlier.
Condition: check the cell date stamp — a pack stored fully charged for a year has already lost capacity.

Cell Type: Li-ion and Li-Polymer charge faster and hold far more energy than the older NiMH packs.
Voltage: the same laptop model can take 11.1 V or 14.8 V, and those are not interchangeable.
Capacity: higher capacity runs longer, but it is bulkier, heavier and costlier.
Condition: check the cell date stamp — a pack stored fully charged for a year has already lost capacity.

Built-in batteries mounted inside the chassis: the full installation tool set is included at no extra cost.
External removable batteries with a release latch: no tools needed, so none are included.
External batteries held by screws: a disassembly tool kit is still included.
Do I need to drain it fully before recharging?
Not at all. Every battery we sell is lithium-ion, not Ni-Cd, so there is no memory effect. What lithium-ion does not like is deep discharge — running the pack to empty repeatedly stresses the cells and shortens their life.

Skip the 12-hour first charge. Use it normally and let it cycle.
Top up when the level drops to 10%–20%, rather than waiting until it is dead.
Storing it long term? Recharge about once a month and keep it above 50%.
Charging while you work, or staying plugged in after 100%, will not hurt it.