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Batteries as they go through recharge cycles hold less of a charge. Your battery will apppear to drain faster because its maximum charge level is lower than it was when you bought the device. You can turn off wifi and bluetooth and only turn them on when you actively need them. Reduce screen brightness to the minimum you need for a pleasant reading experience. If you rely on a sleep cover to put your kobo to sleep, go to Settings>Energy Savings and Privacy and set the 'automatically go to sleep' setting to 5 minutes. Sometimes the sleep cover does not work. Never let the battery go below 20% if you can help it, and stop charging it when it is between 80%-90% full.
It sounds like a corrupted database. You can search this forum for possible solutions. There are many, so please forgive me for not listing them. The easiest is to log out of your kobo account, then log back in. That creates a new database. If you use Calibre, it can detect database corruption. It sounds like you are manually adding books to the Kobo.
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