I have just sent a request to support for clarification on battery changing for the FP3+ as follows:
"Since purchase and continuing after latest update 0066 I have dubious charging issues. I would like to point out that, although some decades ago, I used to maintain sea to air missiles in the Royal navy so have some electronic training
The issue can be broken down as follows.
1. As no battery charger is supplied people have to make their own choices, however I note from the forum that there are the same issues with some who have bought your FP charger and cable.
I have the same problem since a short time. I’m using the original charger and cable. The device and the equipment is approximately 8 months old. I think the problem started with the last Update to 0066. Before that, I had no Chargingproblems."
2. I have kept records lately to try and understand the charging routine.
a) Whatever the battery state 6% or 46% the battery states ‘charging slowly’ Often if I unplug and replug in the cable the notification that the battery is ‘charging slowly’ goes away.
b) Irrespective of notification ‘slowly’ or otherwise the battery charges 1% in just under three minutes, so will take 3 to 5 hours dependent upon initial state. These figures are in Airplane mode with wifi, NFC and Bluetooth off
c) There is never a drop in charge rate at 90% or 96%.
So the questions are
1 Can you tell me the rate of charge expected ‘slowly charging’ and otherwise.
2. Can you tell me how the hardware/software decides at what rate to charge.
I reside off grid use solar panels with a base 12v system. I have an inverter that can supply 230v at 5A so I can use mains chargers.
Generally I use a Belkin 4 USB port 12V to 5.1V (two @ 1.2A and two at 2.4A)
The battery is 3000mAh (not 3040 as advertised)
Over 5 hours this equates, without losses, to some 600mA per hour, well below what I can provide.
Using a mains adapter that provides 5.1 @ 3A is no different.
So although I have no problem waiting 4 to 5 hours I wonder if this is what you expect.
From the following link you will see others with the same and/or similar concerns, there \are other topics too.
Help! Battery charging slowly
Well I hope you can enlighten me/us on what we should expect, and please provide me with details on the hardware and software set up.
Thank you and best wishes."
EDIT 1 The initial reply by email says “We aim to reply within 5 working days”