[ccyg8774]

I have one of that, from same place, only different colour.

Works great at first, but started to behaviour weird after I leave it in -15 cold for few hours one day. (The problems might be related to that, but I am not sure. )

Problems includes:
Back light do not turn on when it should, and few seconds later, the display on the LCD started to become reversed from left to right, AND top to bottom. Keep pressing and it will just go dead.
Recharging it will solve the problem, for few days. after few days, maybe 2 weeks, (The battery should last longer than that, as I've used it for monthes without charging at first) the problems will come back. As I check the battery on the menu of the chrono the battery shows to be almost full, but it just need charging. I think the cold temp have damaged the battery inside the chrono.
New problem I just discovered yesterday:
When I was chronoing my gun, the chrono gives very low readings, such as 14, 25, 28 fps, once in a while, then went dead. After fully charged it over night and chrono'ed my gun again, I got two low reading at first, then everything went normal, and gives right readings.
I still think there is a problem with the battery of the chrono, maybe I will make a battery pack small enough to fit in, to replace the old one sometime, hope it will solve the problem.


Update 4th April:
After replacing the internal battery (a 3.7V very small lipo) with a similar battery (luckily these batteries are easy to find as small RC model batteries), the problem is solved. It no longer gives very low readings or missing readings, and the screen no longer blinks. I checked the old battery,it looks fine externally, but it appears to have unstable voltage sometimes.
Everything is fine with the chrono now, but I would not recommend it. If anyone already get one... Don't bring it to temperature such as -15C, the internal battery could be damaged.