Rechargeable batteries cost more than regular batteries, but over a short period of time they can end up saving you money. Improvements to rechargeable batteries have reduced the possibility of getting a "memory effect," which refers to a battery that appears to be fully charged but is only partly charged. It usually happens when batteries are not...
M/F Charge your rechargeable battery until the monitor indicates it's full. Turn on the device the battery is used to power. The power indicator on your device tells you the battery is full.
M/F Open as many applications on your device as you can. You need to use as much energy as quickly as possible, then let the power indicator reduce. When you are prompted to recharge your battery, ignore the warning and continue to use your device. The device turns off automatically. However, your battery is not fully discharged.
M/F Turn on your device. Leave it on, but don't open any applications. Ignore any warnings to charge the battery. Wait until it automatically turns off. The battery is almost discharged.
M/F Turn on your device. If it doesn't power up, your battery is fully discharged. If it powers up leave it until it turns off again. Repeat until it won't power up.
M/F Charge your battery. Use the lowest charge you can if your charger has a variable charge rate. If it doesn't, leave it to charge in the usual way. It will take longer to charge than usual because your battery is fully discharged. The longer it takes, the better the result will be. Once fully charged, your rechargeable battery is refurbished.