Jerrycobra
Newly Enlightened
- Joined
- Mar 30, 2010
- Messages
- 47
Hey guys i have had a jet beam bc40 for over 1/2 a year now and recently got new 18650s to replace the uneven discharging cheap ultrafires I bought for it. So far i love this light, and the UF's have done well enough for what it is. The replacement batteries I got are tenergy button top 18650s. problem is, when i put them into the light, something felt off, and was tighter than usual to seat the tail cap compared to the UF 18650s. when i removed cap, i noticed an indentation in the negative terminal of the tenergy's, looks like the tail cap springs dug into it. I went on the measure the battery, and they are approx 1mm longer than the UF. My question is, anyone else encounter this problem? for reference the tenergy cell is a hair over 69mm long. light works fine, but i don't want to damage the batteries any further, and bottom out the springs. also the tailcap spring is much firmer than the spring at the head ( maybe the battery is just cheap and cannot take the compression?)