So i've made some mistake, they say the intercom should be charged with output range 500-1000mA, last night i charged it using a fast charger by mistake, now usually the intercom battery life lasts for whole day, now it only lasts around 1-2 hours, i've tried to replace the battery but nothing seems to work, any suggestions or advice on how to repair this issue?
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Hi @edwinjinata,
Does the device indicate that the new battery is ever fully charged when you charge it ?
Seems like you may have damaged the battery management circuit in the device.
Can't find any schematics or even a teardown for the device, but since you've replaced the battery you know how to open it already ;-)
If you have a DMM (digital mulimeter) you could check what the charging voltage is at the battery connector when the charger is connected.
Looking at an image of the battery, to charge it correctly it would need to have 4.2V DC being applied to the battery cable plug (red and black wire connections). The image also shows that the battery has what looks like a overcharge/over discharge protection circuit built in so as to ensure that the voltage is no higher than this.
If the charging voltage is <4.2V DC then the battery won't be charged properly.
Check the circuit board in the device for any obvious component damage e.g. burnt out or heat stressed components etc. If you can't see anything obvious, post some close up images of the board (both sides?) as others may see something you missed. Here's how to post images in your question on ifixit Adding images to an existing question
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