What's the biggest battery you can fit in a Gen.4?

20 - 50mA is normal current consumption when locked. Is your reading of 200mA when the car is locked or unlocked? "00mA will drain the Jimny battery in about a week (nearly 5Ahr/day).

It might be your Kenwood, check that the permanent live and ignition are wired in the right place.

Does the radio switch on without the key in the ignition? If it does the Kenwood might be drawing too much current in standby.

Do you have an active DAM antenna, does that run all of the time?

The easest way to tell would be to remove the radio and test again with you meter to see the difference.

Also try disconnecting the alarm, that might have a high current draw.

A dashcam running in park mode is going to take a bit of current.

Robin

Thank you all! I finally debugged the circuitry. I had to contact the manufacturer and service center explained how the alarm's power draw changes after locking the car. 200mA was only for the first few minutes. Jimny was taking ~55mA when locked without alarm connected. With alarm on I had to wait ~20 minutes before it went to sleep and back to 50-60mA. However every few minutes it spikes to around 80mA for a couple of seconds.

Anyway I have to change the battery as it went dead during winter and desulfation didn't help much. I was misled as the KONNWEI KW510 battery tester showed GOOD status for the battery health. It reached rated CCA of 370A when was fully charged but dropped to ~260A at 12.3V.

After considering all pros and cons I chose EFB battery which has 55Ah (+10Ah vs stock) and has almost same size as the original one. The model is Sebang EFB N55L 55Ah (L/W/H [mm]: 235 / 125 / 190).

   

I have experience of high standby currents dropping after a few minutes, my other car (Porsche Boxster) draws nearly 1A when you first switch off the ignition, then after an hour it settles back a bit, not sure what the level is tbh. However, after 6 days it disables the remote locking, to save current, so for 6 days it must be sat there drawing a large amount of current for very little gain. As regards electrics/alarms it’s completely standard.

It has an 80AHr battery which it will flatten in about 4 to 5 weeks if you don’t use it, so must be drawing upwards of 100mA.

The battery is in the front which is an electronic release, so if the battery runs down you have to open with a key then connect a decent battery with jumper cables to the footwell fuse box whilst the alarm goes off and stops the bonnet opening, a right pain.

wrote:

Unless you match the alternator with the bigger battery you run into potential issues with over working the alt which could over heat it and kill it prematurely. If however you are looking at a supplementary battery on a split charge system for additional loading that's different but really still needs a bigger alt.

My Gen 4 Jimny's alternator quite happily charges my 2 auxiliary batteries (both 100AH). My Jimny is 4 years old and there is no indication that the alternator doesn't cope.