Malachite V5 SDR RX - charging problem

After not using the SDR RX Malachite V5 for a long time, I found that the SDR could neither be turned on nor charged. The problem occurs when the battery is discharged. The initial charging current is so high that the power supply is disconnected due to the high current. The situation is complicated and cannot be solved without disassembly or modification. The options are described here.

1. The first option. Remove the buttons and unscrew the 4 screws from the side panel. Disconnect the battery connector and connect the battery to an external adjustable power source. Set the voltage to 3 to 4 V and limit the current to 200-500 mA. Recharge the battery to a voltage above 2.8 V. Reconnect and the SDR should recharge and work normally.

2. The second option is to modify the charger connection. If you add three diodes connected in series across the charger, the voltage connected to the battery from the USB will be 5 V minus approx. 2.1 V = 2.9 V. This is a safe charging voltage that will restore battery charging. The protective circuit in the battery will connect the battery and charge it to approximately 2.9 V. Charging will then continue from the charging circuit until full capacity is reached. 

These diodes will therefore ensure that a discharged and disconnected battery is "started" charging. Classic 1N4007 and similar diodes are suitable for this purpose.