So I found a bug that the large battery will not charge beyond 240 even with the actual capacity is 24000. I unloaded the plugin and it immediatly started charging beyond 240. I haven't tried other batteries.

Default configuration with bettery electricity v 1.2.3. other plugins: admin radar, autofuel, bot spawn, chinook drop randomizer, combat logger, inbound, logger, no decay, powerless turrets, vanish, visual cupboard.

That actually isn't quite right. If you delete your config it will have the correct config.