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by vh2q
Mon Jan 11, 2021 9:46 am
Forum: Batteries and Battery Management
Topic: Deep Cycle Accy Batty
Replies: 1
Views: 129

Deep Cycle Accy Batty

Would a deep cycle battery not be more appropriate for these cars than the std lead acid? No cranking. But sometimes, if you let the car sit, it does drain the accessory battery.
by vh2q
Sun Jan 10, 2021 11:17 am
Forum: Batteries and Battery Management
Topic: How to charge a 4 cell module out of the car
Replies: 15
Views: 2961

Re: How to charge a 4 cell module out of the car

Pack seem to be OK, never went below 3.3V per cell, all cells coming up and equalized even though I am gang charging. Going to swap this pack out soon. Meanwhile the car has stopped taking a charge at all .. lights on charger cord don't come on at all neither do fans. I am assuming voltage of the ba...
by vh2q
Sun Jan 10, 2021 9:05 am
Forum: Batteries and Battery Management
Topic: battery cover bolt size
Replies: 0
Views: 252

battery cover bolt size

I am going to remove my batty pack to replace one of the 4 cell packs. I have read that the small bolts securing the undertray shear off. Can someone tell me the size so I can have some spares handy? (Car is in a remote place where you can't go down to fastenal). Anything else I should take with me?
by vh2q
Fri Sep 18, 2020 10:28 am
Forum: Batteries and Battery Management
Topic: How to charge a 4 cell module out of the car
Replies: 15
Views: 2961

Re: How to charge a 4 cell module out of the car

Hooked up NOCO in "repair mode" and it's bring up the 4 pack slowly. Took all morning to get from 4.06V to 4.15V. It's delivering 1.5A. So I think that's the ticket. I'll bring it up to 16V, check the balance, and then ship it over to the island. I'll bring the existing pack to 4V per cell...
by vh2q
Wed Sep 16, 2020 11:53 am
Forum: Batteries and Battery Management
Topic: How to charge a 4 cell module out of the car
Replies: 15
Views: 2961

Re: How to charge a 4 cell module out of the car

Great! Thanks. I can put it on a boat or there is an air charter service that says it's AOK to bring on board with me. Will charge that sucker up to 4V per cell, and when I get to Bahamas, will charge the rest of it up (or discharge) to match (have hobdrive). Anyone who wants a free vacation and is ...
by vh2q
Wed Sep 16, 2020 7:13 am
Forum: Batteries and Battery Management
Topic: How to charge a 4 cell module out of the car
Replies: 15
Views: 2961

Re: How to charge a 4 cell module out of the car

I am in Texas ... car is in Bahamas. No option but to fix it myself. NOCO Genius 3500 ... "repair mode" supposed to emulate a DC supply at fixed voltage 16V but I a pretty sure it's current limited. Is there any (safe) way to test this mode? In open circuit, you can't put it into this mode...
by vh2q
Tue Sep 15, 2020 9:39 am
Forum: Batteries and Battery Management
Topic: How to charge a 4 cell module out of the car
Replies: 15
Views: 2961

Re: How to charge a 4 cell module out of the car

Thanks. I am assuming we are not talking about a tiny electronic resistor here, the heat would burn it up? that's why I was looking for a common object that might serve as a resistor and take the heat ... and the way I measure them my vise grips have a resistance of about 1. 4 ohms. With the added b...
by vh2q
Sat Sep 12, 2020 1:25 pm
Forum: Batteries and Battery Management
Topic: How to charge a 4 cell module out of the car
Replies: 15
Views: 2961

Re: How to charge a 4 cell module out of the car

The replacement 4 pack showed up today. Each of the 4 cells measures 3.56V. So not dead and no bad cell. I plan to swap out the entire pack, even though only 1 of the cells in my vehicle pack is lagging significantly, and one other is a bit behind. So now about the charging. I am hesitating to hook ...
by vh2q
Mon Sep 07, 2020 9:26 am
Forum: Batteries and Battery Management
Topic: How to charge a 4 cell module out of the car
Replies: 15
Views: 2961

Re: How to charge a 4 cell module out of the car

My RC charger is a "Triton" and it says it charges both Li Ion and Li Po batteries, up to 4 cells (which is nominal 14.8V) 2.5A max charge current. The manual says when set to Li Ion mode, it uses the "constant current/constant voltage" method, ie you set the current and it suppl...
by vh2q
Sun Sep 06, 2020 1:26 pm
Forum: Batteries and Battery Management
Topic: How to charge a 4 cell module out of the car
Replies: 15
Views: 2961

How to charge a 4 cell module out of the car

Saga continues. One of the 4 packs in my drive battery is a laggard according to Hobdrive. Cell 41 is at 3.79V when all the others are at 4.1V so it triggers the turtle for the whole pack before one gets very far. Bought a good 4 cell pack and plan to switch out. I read on this forum that one must c...

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