Battery clamps can corrode, get loose or crack--and some customers will come looking for a way to put a new clamp on their existing cable. There's the old inexpensive saddle-type clamp, but that isn't a very good solution. There are actually four very good ways anyone can replace a battery clamp without special tools.
Easiest and best: Quick Cable Compression Connectors. These are high quality cast copper heavy duty connectors you install with a wrench and a screwdriver. These are tried and true and actually the first product Quick Cable brought to market as a Quick Connector.
Not quite as easy, but a super connector: Quick Cable Fusion Connectors. These connectors are cast copper, heavy duty, and have solder and flux built in. You need a pair of Vise Grips or something to hold the connector and a torch, but you can make a superior, permanent connection easily. There are safety considerations if you're working under the hood with an open flame--you have to be well away from the battery, fuel lines etc.
Almost as good as the first two: Quick Cable Tie Bolt connectors. These work on cable from 6 to 1 gauge; the patented tie bolt design clamps down around the wire for complete contact so there is a secure electrical connection.
All three of these ideas are great as long as you have enough battery cable available. Sometimes, though, if you cut a bad clamp off, then the cable is too short and if you put a new clamp on, it won't reach. That leads to the last idea: Quick Replacement Ends.
Quick replacement ends put together a replacement battery connector, a length of cable, and either a tie bolt or a compression cable connector. Now, you can replace a connector without special tools and without worrying about whether you can reach the battery.
You don't have to have all the specialty tools that a cable making shop has to fix a battery cable. You just have to have the right connectors. With the right solutions you can help your customers out of a bind and help them do a DIY repair that works.