Why is a new battery still not fully charged after 13 hours?

1 Answers
DeDavid
07/25/25 12:56am
New battery not being fully charged after 13 hours is due to a blown battery fuse or poor contact between the fuse tube and fuse socket. Below are specific details about charging a new battery: 1. Master the charging time: The first charge of a new battery affects its lifespan and charge capacity. Insufficient charging will result in lower charge capacity and reduced lifespan; while overcharging may improve electrical performance but also shortens the battery's lifespan. Therefore, it's crucial to properly time the first charge for a new battery. 2. Charging method: First, use the initial current (one-tenth of the battery's capacity) until the electrolyte bubbles and the single-cell voltage rises to 2.3-2.4V. Then, continue charging with half of the initial current until the electrolyte bubbles vigorously, and the voltage remains stable for 3 hours. Generally, after the charger indicator light turns off, continue charging for 1-2 hours. The total charging time should be about 8-10 hours. Avoid overcharging as it can negatively impact the battery's lifespan.
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