If you don't have or can't afford a smart charger for your airsoft weapon's batteries, do what I do. I use a standard household lighting timer and just set the timer for the proper amount of time your battery requires. A household timer is an inexpensive solution to charge your batteries and not damage them in the process.
This is a good idea. I typically just calculate the time to the nearest fifteen minutes and set an alarm on my phone, but this would be much more convenient for overnight charging and such.
Is this a lipo battery? If it is you NEED to buy a actual lipo balance charger or you will RUIN you battery, Food for thought , If you need some pointers on where to acquire inexpensive quality charger batteries and most electrical please talk to me I supply many of our players. Also at some point you may want to consider getting rid of you tamiaya plugs in exchange for some deans they will improve you trigger response and battery life.
The battery shown is not a lipo battery.