The Ruger LCP- Accu-Guard Laser Sight DS-122 is solely just the laser. The light by itself can be found by using the link below:
https://www.opticsplanet.com/crimson-trace-crimson-trace-ltg-770-lightguard-100-lumen-led-white-light-for-smi.html?_iv_gun-make=ruger&_iv_code=CT-FLW-CTWL-LTG-779&_iv_gun-model=ruger-lcp
You can purchase the batteries online or request them on the following link https://www.crimsontrace.com/support/free-batteries-for-life/
No, it will not.
No, this is meant specifically for the LCP handguns which are smaller than the LC9/LC380 models. This laser unit will not fit an LC380. You will need something like MPN: LG-416 for the LC380.
No, here is a link to a trigger guard model that will:
https://www.opticsplanet.com/crimson-trace-instinctive-activation-laser-guard-for-ruger-lc9.html
This will only fit the first gen LCP pistols, it will not fit the LCP II. For the LCP II you would need this version instead: https://www.opticsplanet.com/crimson-trace-laserguard-for-ruger-lcp-ii.html