How to Choose a Replacement Battery That Actually Lasts
A replacement cell is not a commodity. Capacity ratings, cycle life and the quality of the protection circuit vary enormously between suppliers, and the cheapest option usually shows it within a few months.
Buyers comparing options often start with replacement batteries because the listings state chemistry and capacity plainly instead of hiding them.
What to check before ordering
Match the voltage exactly, check the connector type against your device, and prefer sellers who publish real cycle-life figures. A supplier willing to state limits is usually the one worth trusting.
Keep the old cell until the new one is tested under load. Variant 5.