Why does the new U1571A battery pack for my U1602/4A Handheld Oscilloscope last less than the stipulated 4 hours…

The new U1571A battery pack for your U1602/4A Handheld Oscilloscope lasts less than the stipulated 4 hours because it was probably not fully charged prior to its first use.

To recover its optimum operating time, follow the steps below:

1. Unplug the 3-wire battery connector from the PCBA board.

2. Reconnect the battery connector.

3. Follow-up by fully charging the battery for 25 hours with the instrument turned on.

It is advisable to charge the instrument periodically even if it is not in use because the rechargeable battery may drain off with time.

Note: It is often necessary to fully charge and discharge a new NiMH battery a few times before it can reach its peak performance and capacity.