Question Can I use a Lithuim Ion Lipo Rechargeable Battery instead of 18650 Lithium Ion cells with the RVL PMS?

Joined
Jul 16, 2020
Messages
19
Likes
2
Location
Illinois, USA
Basically lithium cells are too think for me too use in a project I'm planning to work on so I was wondering if I could just get one of those flat rechargeable battery packs and hook that up to the RVL PMS?
I'm looking at something like this Here
 

Pablo

.
Joined
Jan 4, 2019
Messages
42
Likes
37
Portables
3 - G-Wii, Gamebii, G-Boy
I don't belive they work natively with the pms due to the slightly differing voltages, the frimware needs to be modified slightly. Gman knows more about it, but don't wire them in until you get the go ahead.
 

StonedEdge

a.k.a. ClonedEdge
.
.
Joined
Nov 16, 2018
Messages
372
Likes
1,511
Location
Japan, Tokyo
Portables
2
The PMS will work with any lithium polymer/ion chemistry in a 1sxP configuration, but the main concern is that current for fast charging is set in firmware (3A) which is a lot higher current than a single cell (18650 Li-ion) can generally handle. Currently, Gman has it it set to 3A, which is too high generally for a single cell application for portables. Everything changes depending on the specific cell specs, but as a general rule, lithium cells safely charge at 0.5C rates (read the maximum charge current rating in cell datasheets to be certain). The maximum fast charge current limits can be adjusted in firmware, specifically REG04 (ICHRG) for the BQ25895 by changing the first 7 bits to whatever you want the charge current to be. This requires a PICkit3 to re-program the uC though.
 
Joined
Jul 16, 2020
Messages
19
Likes
2
Location
Illinois, USA
The PMS will work with any lithium polymer/ion chemistry in a 1sxP configuration, but the main concern is that current for fast charging is set in firmware (3A) which is a lot higher current than a single cell (18650 Li-ion) can generally handle. Currently, Gman has it it set to 3A, which is too high generally for a single cell application for portables. Everything changes depending on the specific cell specs, but as a general rule, lithium cells safely charge at 0.5C rates (read the maximum charge current rating in cell datasheets to be certain). The maximum fast charge current limits can be adjusted in firmware, specifically REG04 (ICHRG) for the BQ25895 by changing the first 7 bits to whatever you want the charge current to be. This requires a PICkit3 to re-program the uC though.
So how exactly would I go about doing that? Sounds kinda of difficult to me
 
Top