Testing the same 2Ah battery (PRT-08483) discharged at 2A until the battery voltage drops to 2.5V. If you need a faster charge (for larger capacity cells) it is possible to connect two chargers in parallel using the + and - through holes next to the battery connector (they stack very neatly as long as you leave room for the Micro / Mini USB connector). ![]() The lower the voltage of the battery and the higher the temperature the lower the average charge current. The current depends on the voltage of the battery and the temperature. ![]() The charger does not deliver a constant current to the battery. I see some comments about rate of charge using this low cost handy charging circuit. Then it stops charging, until the voltage drops to 96.5% (4.05v), at which point it will charge again. With chips marked KFxx (MCP73831T-2DC), there is no preconditioning charge it just starts charging at the chosen current (500mA) until the voltage reaches 4.2v, then holds at 4.2v until the charging current decreases to 7.5% of the charge current (37.5mA). Then it stops charging, until the voltage drops to 94% (3.95v), at which point it will charge again. With chips marked KExx (MCP73831T-2AT), if the battery is below 3.00v, it will charge the battery at 10% of the charge current (50ma) until the voltage reaches 3.00v, then charge at the chosen current (500mA) until the voltage reaches 4.2v, then hold at 4.2v until the charging current decreases to 20% of the charge current (100mA). With MCP73831 chips marked KDxx (MCP73831T-2AC), if the battery is below 2.79v, it will charge the battery at 10% of the charge current (50ma, if the resistor is not changed) until the voltage reaches 2.79v, then charge at the chosen current (500mA) until the voltage reaches 4.2v, then hold at 4.2v until the charging current decreases to 7.5% of the charge current (37.5mA). Which version of MCP73831 is used on this product? And is the same part always used? From a previous comment, I see it is a 4.2v version, but there are also 3 different versions with varying preconditioning currents and thresholds, and termination currents.
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