Li battery charger. Multiple cells in parallel?
max72
Posts: 1,155
I'm using a GSM module, and the power requirements are perfectly compatible with a Li-ion battery, like the Tenergy sold from Parallax.
The alternative is to have a higher voltage cell, and a big, fat, 4V power regulator. I'm testing a very low power set-up, that sends an SMS every few hours, and then sleeps for a couple of hours.
In this case the idle 4V regulator power requirements are dominant over the 3.3V LDO and a sleeping propeller. So 3 AA batteries are a nice option, but the Li-ion is so intriguing... but i'm greedy, so I want more than 1 cell in parallel, so here is the question:
Being a single cell I was considering a single cell charger like the MAX1551 or MAX1555.
Can I safely charge more than 1 cell in parallel, or should I use a charger IC and a protection diode for every cell?
I attach 2 possible solutions, but I would like your opinion.
Thanks in advance,
Massimo
The alternative is to have a higher voltage cell, and a big, fat, 4V power regulator. I'm testing a very low power set-up, that sends an SMS every few hours, and then sleeps for a couple of hours.
In this case the idle 4V regulator power requirements are dominant over the 3.3V LDO and a sleeping propeller. So 3 AA batteries are a nice option, but the Li-ion is so intriguing... but i'm greedy, so I want more than 1 cell in parallel, so here is the question:
Being a single cell I was considering a single cell charger like the MAX1551 or MAX1555.
Can I safely charge more than 1 cell in parallel, or should I use a charger IC and a protection diode for every cell?
I attach 2 possible solutions, but I would like your opinion.
Thanks in advance,
Massimo
1024 x 1117 - 54K
Comments
From the datasheet they are 2 or 3 matched batteries with protection circuit directly assembled by tenergy.
This explains a lot of things..
Massimo