Milliamp hours or "mAh" is a rating or measurement of the capacity of a laptop battery pack. Sometimes it is expressed as watt hours (Whrs). Either measurement is an expression of the total amount of energy a battery can store. So, the higher the mAh rating of a battery, the longer the run-time. A similar analogy is to think of it like you think of the size of the fuel tank in your car. The more gallons of gas your fuel tank can hold, the farther you can drive. In battery packs, the higher your mAh rating, the longer you can power your laptop without an AC Adapter. Your IBM ThinkPad W500 device can accept different mAh ratings. We always try to carry the longest run-time batteries we can find.

Sure! If you have not already tried, give the SEARCH box in the upper left corner of the home page a try. It is best to type in either your laptop model number or the actual battery part number from the battery. You can also click on "Laptop Batteries" from the navigation menu on the left hand side, then select the brand of your computer and go from there. We support all brands of laptop manufacturers including IBM, Dell, Apple, Sony, Compaq, HP and Toshiba to name just a few. If you are still having difficulty finding exactly what you need call us toll-free during normal business hours or send us an e-mail anytime. One of our Laptop Battery Consultants will be happy to help you find your battery.

You may choose any method you like - from First Class Mail to overnight delivery. If you choose our complimentary shipping option we will either send your laptop battery via Priority Mail or UPS Ground depending upon your location. If you want to get a tracking number on your shipment, please call us towards the end of the business day and we will be happy to give that to you.

96% of our weekday orders that are received before 1:30 p.m. Pacific Time (4:30 p.m. Eastern) will ship out the SAME DAY.Orders received on the weekend will ship the following Monday. This excludes holidays of course and some special order items and any item that is not in stock. We try hard to only show those items on our website that are actually in stock! If we have a problem with your order, we will try to contact you immediately.

Please email us at info(at)batteriesdirect.com to obtain a Return Material Authorization number (or RMA#) so that you may return your item for your refund or exchange. We understand that customers may sometimes order the wrong thing, discover that the problem was not their battery afterall, or sometimes receive a defective battery. We will handle your exchange or return with the respect you deserve.

We don't know how to put this delicately so we won't try... You usually get what you pay for and that is especially true with laptop battery packs. "The same" or "less" can sort of seem "the same" and the amount might appear to be "less" but is it really? Many times we find that there are hidden shipping fees that you can't discover until you have completed the entire shopping cart. How annoying is that? Check to make sure the mAh rating and quality of the battery pack really up to BatteriesDirects high standards. What is their return policy? Can you get ahold of the company easily if you are unhappy with your purchase or if you have questions on your order? Do they offer you a toll-free number and physical address on their website? Are they actually accredited members with the Better Business Bureau? How does their 30 or 60-day warranty compare to our full year (365 day) warranty?

Well that sort of depends. First let's make sure that we are looking at the battery from the same point of view. Are we showing the top, bottom, front or back of the battery in our picture? We try to show the part that will best set it apart from the thousands of different laptop batteries out there. If you have taken the battery out of your laptop and oriented it so that you can compare it to our image and you still are not sure, please give us a call. From time to time we may make a mistake and post either the wrong laptop battery picture posted to the website or maybe even have an incorrect cross reference. If you are not sure, please call us.