Batteries, holders and clips

this is result of a long research. there are many products and many kinds of batteries and we have samples of them all here.
problems to care for:
– contact quality: flat contacts oxidate and you get loud cracks. so use clips or springs
– replacement quality: sometimes you are in a hurry…
– rattling: for batteries in guitars, its important that they do not move, because they may rattle at some notes and the pickup brings it to the public…

so we invite you to look through the best products we found, read our observations and please add yours!