Agreed. But some people do exactly that. As the battery packs of cheap "cree" lights (which is a misnomer, because they are manufactured by various chinese company's and advertised as having cree brand LED's but alot of times dont) often times have poor quality battery cells from recycled laptop's or even fake cells, but you can buy a good battery and multiple light heads incase one dies. I have multiple cheap amazon lights with no problems with lights or batteries but I do not need 3+ hours of runtime but as output of these lights is usually some amount lower than claimed, or vastly lower, even with included batteries you may or may not get 2+ hours at least.