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Resellers Main batteries The main battery is the battery used to power portable computers when a supplement of steady power is unavailable. When looking to purchase a new main battery from a third-party, ensure that you have verified through the manufacturer of the portable computer that you are getting the correct type of battery. Verify the below specifications (this information may be also listed on the battery):
| Type: | Verify the type of battery required: NICAD / NiMH / Li-ion |
| Manufacturer: | Some portables may use a certain manufacturer of battery. Verify if a third-party manufacturer's battery was used. Also ensure that the battery is not proprietary and that it is possible to purchase from a third-party. |
| Voltage: | Verify the Voltage of battery, this amount can vary depending upon the type of battery. |
| Mah: | Verify the Mah of the battery, this amount can vary depending upon the type of battery. |
Before purchasing the battery, see if the battery comes with any type of warranty and how long the warranty may be. Ensure that if the battery is defective that it is possible to return the battery for a new battery or for a refund. Once you have received the battery, generally, instructions should be included on how to charge the battery properly for first use. If no instructions are included, it is recommended that you charge the battery for at least 24 hours before use.
| Battery | Estimated price |
| 1 NICAD Battery | $80.00 to $150.00 |
| 1 NiMH Battery | $100.00 to $160.00 |
| 1 Li-ion Battery | $100.00 to $180.00 |
Prices can vary depending upon quantity of batteries and how old the laptop may be. CMOS batteries The CMOS battery is used to store system information and should be replaced when receiving error "System battery dead", the computer does not keep the time or date, or if you are losing a dramatic amount of time over a period of time. Before replacing the CMOS battery, you will need to determine the type of CMOS battery you are using. We have listed pictures of the various types of batteries found in computers on our CMOS Battery Help page. Once you have located the battery, you should be able to find all information required on the battery itself. If you are unable to locate any information about the battery or are having a difficult time finding a replacement, we recommend that you visit a local Radio Shack and see if the sales representative
can help you identify the battery.
| Battery | Estimated price |
| CMOS coin battery | $1.00 to $10.00 |
| CMOS RTC battery | $2.00 to $20.00 |
Prices can vary. Bridge batteries The Bridge battery is a small battery that holds a charge for a sufficient amount of time while the end-user swaps a battery that may be going good with a known charged battery. If you believe that this battery is defective or bad, it is recommended that you contact your portable manufacturer for a replacement part. Resellers 1800batteries
Ebatts.com
GoBattery
Batteries Plus
Rayovac Direct | 
