How long does it take for Sanyo's 2500 mA rechargeable battery to be charged by photographer 150-250 mA charger?

The capacity of rechargeable battery is not milliampere, but milliampere. The last h stands for hour.

It means milliampere hour. It represents the product of the discharge current when the battery works and the time it can continue to work.

2500mAH, that is to say, if the working battery is 25 mAh, it can work 100 hours; When the working current is 250 mA, it can work 10 hour, and when the working current is 2500 mA, it can only work 1 hour.

Ni-MH rechargeable battery needs to be charged to 150% of the battery capacity.

Charging time (hours, h) = capacity (mA-hour, mA) × 150%÷ charging current (mA, mA).

For 2500mAH batteries:

If it is charged at a current of 250mA, it needs to be charged 15 hours;

It takes 25 hours to charge at a current of 150mA.

It takes six and a half hours to charge at a current of 565mA.

For this kind of large-capacity rechargeable battery, in order to shorten the charging time, it is necessary to use a fast charger that can provide a large charging current.

In addition, it is best to use a fully automatic charger, so that the charger can automatically judge whether the battery is full, and when it is full, it will automatically switch to trickle charging to avoid damaging the battery due to insufficient or overcharge.