"I purchased a battery for my MacBook on August 22, 2012.
They sent the wrong battery in the mail.
After informing that they sent the wrong battery, they mentioned the battery I wanted to have was out of stock.
Here is the transcript:

"Dear ---,
Thank you for providing the part number. Unfortunately we are out of stock on this battery and we are not able to send you a compatible battery at this time. We will provide you with the return instructions within 24 hours so you can send this battery back for a refund.
Kind regards,
BattPros.com
1-***-***-****"

Then I receieved:

"Dear ---,
You may return the product in its original condition and packaging to the following address and we will be able to issue a refund in your account:
Shipping Department
RMA HF######
1980 US HWY 1, Building 3
North Brunswick, NJ 08902
Please make sure to write "RMA HF###### [number withheld here]" on the package you are returning. Packages received with no RMA number written on them may be delayed in processing or returned to sender.
Please visit our website or click on the following link to learn about our warranty policy:
http://www.BattPros.com/warranty-policy.html
Please allow about two weeks after sending the battery to see the refund posted on your account. Thank you for choosing BattPros.com; we appreciate your business.
Kind regards,
BattPros.com"

I sent the package with delivery confirmation. They evaded answering my calls and emails for ~6 months. Finally, I got a guy named Sean. Here is my followup message, sent on April 5, 2013:

"Hi Sean,
We spoke earlier this week about an item I ordered, but received the incorrect product.
The item was shipped back with the promise of a refund, but none was credited to my account or mailed to me.
When we spoke on Tuesday you mentioned the item had not been received.
Here is the confirmation number of the 14.50 oz package: #### (number removed).
It arrived at 10:15 am on October 15, 2012 in New Brunswick, NJ and delivery was completed.
I also have a copy of the USPS receipt, as well as pictures of the unopened bag and the original box with the appropriate information labeled. I took the liberty of including a printed edition of the string of emails below in the box with the incorrect battery.
Please advice and resolve as quickly as possible. This refund is long overdue."

No response from Batt Pros in over three years since then... They won't answer phone calls, won't respond to emails. They still owe me $58.50..."

"Battpros sent me the wrong product and now will not return my phonecalls. Very, very poor customer service."

"Quality product at a good price."

"Resolved the failing battery problem with my Aspire 5570Z perfectly."

"Purchasing through Batt Pros was very easy. They had what I needed, it was packaged very well and shipped quickly. I would definitely order from them again!"

"Very easy website to use, found everything I wanted to. Customer service was great. They did charge me a foreign transaction fee but they refunded it after I emailed them. All in all a great experience and extremely happy with using them. Product I ordered (battery) was delivered in decent packaging also. I recently did my 2nd order from them."

"Shopping on your site was very easy with no problems. I will be happy to recommend your site to my friends. "

"went well. everything arrived as advertised"

"Received today, 12/17/2012. On the charger now. "

"a year ago i got a battery for my asus laptop and found i did not need it. batt pros took it back with no hassle. when i found i did need it i went to them again. there service was incredibly fast and i am up and running again. "

"I was very pleased with the easy online ordering, and the deliver was very quick.

Thank you very much.

Merry Christmas and a Happy, Healthy New Year to ALL.

gail brace"

"The charger I wanted was ordered and delivered with no problems. "

"Well, they were a little slow out of the gate. However, I did receive it on Saturday the 15th. Though the battery does snap in to it's slot, it is a slightly different case - it has NO rubber foot like the original batt. has. This prevents the computer from sitting flat, on four rubber feet, like it should. So I'm going to have to improvise something such as a glued on piece of rubber material to keep the computer level. So I'll give `em 4 stars."

"The battery Got here fast never have had a problem wih any batterys I have goten from you I'm geting ready to make a order
now.
James"

"My battery arrived in a timely manner, was a near-exact replacement for the OEM battery, and was mostly charged when I received it."