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BMW 3-Series (E90 E92) Forum > BMW E90/E92/E93 3-series General Forums > General E90 Sedan / E91 Wagon / E92 Coupe / E93 Cabrio > Battery Charger for MHD Flashing



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      12-09-2018, 09:19 AM   #1
carguy138
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Battery Charger for MHD Flashing

Thinking about ditching my JB4 and trying MHD. I currently have one of the BMW battery charger/tenders but the charging max amperage is 1.25amps.

I was wondering if it would be possible to safely use a high end RC car battery charger during the flash process. Duratrax Intellipeak Ice (cost around $130 and $50 for a DC power supply).

Here are the charger specs and a link to the manual. It doesn't mention anything about specifically charging lead batteries, only NICD/NIMH/LIPO/LION.

I would think with a 6amp charge on 11.1v lipo charge profile, I should be fine? I can monitor battery voltage on the charger and will shut off it it goes about a predetermined threshold (say 14.5v).

http://manuals.hobbico.com/dtx/dtxp4170-manual.pdf

Input Voltage:
11-15V DC

Battery Types, # of cells:
1-10 Nickel-Cadmium cells (1.2 - 12.0V NiCd)
1-10 Nickel-Metal Hydride cells (1.2 - 12.0V NiMH)
1-4 Lithium-Ion or Lithium-Polymer cells
(3.6 - 14.8V Li-Ion/Li-Po)

Battery Capacity Range:
100-9900mAh

Fast charge current:
0.1 - 8.0A (1C max for Li-Ion/Li-Po)

Fast charge methods:
linear, reflex, impulse and 4-step

Fast charge termination:
peak detection for NiCd and NiMH
constant current/constant voltage for
Li-Ion/Li-Po (cc/cv)
optional thermal cutoff for all battery types

Peak Sensitivity:
0 - 25mV adjustable

Trickle Charge Current:
0 - 500mA (n/a for Li-Ion/Li-Po)

Top-off Charge:
0 - 1000mA (NiMH only)

Discharge Current:
0.1 - 10.0A adjustable (2C max for Li-Ion/Li-Po)

Discharge Cutoff Voltage:
0.1 - 1.1V per cell NiCd & NiMH
2.5 - 3.7V per cell Li-Ion/Li-Po

Temperature Cutoff Range:
50 - 132° F

Cycle Count:
1-10 cycles (n/a for Li-Ion/Li-Po)

Cycle Cool-off Delay:
1-30 minutes adjustable

Battery Memories:
10 battery memories

Display Type:
8 x 21 LCD (168 characters max)

Graphical Displays:
graphs charge and discharge voltage curves

Output Connectors:
banana jacks (two adapter leads included)

Motor Break-in:
1.0 - 8.0V selectable, 1 - 180 minutes,
10A constant, 30A surge
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      12-09-2018, 09:34 AM   #2
Some Asian Guy
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I wouldn't use that seeing as how lead-acid batteries isn't on that list. You can get battery chargers for cheap, so why risk it? I use a Schumacher battery charger I got from a pep boys for $25.
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      12-09-2018, 10:07 AM   #3
carguy138
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Quote:
Originally Posted by Some Asian Guy View Post
I wouldn't use that seeing as how lead-acid batteries isn't on that list. You can get battery chargers for cheap, so why risk it? I use a Schumacher battery charger I got from a pep boys for $25.
Lipo charging profile is very similar to lead acid batteries. If anything it would stop charging earlier (example 3 cell lipo, 11.1v will cut off at 12.6v. Lead acid 12v profile would cut off around 14v).

I can manually set the adjustment to 10cell NICD or NIMH for 12V, and 14V cutoff. For example charging at 2 amps, as it gets close to 14V, it tapers off the charge to 1.9, 1.8, 1.7, all the way down to .1 amps as it reaches 14V.

Basically this charger has a lot more adjustment than any of the cheaper auto specific chargers. Just looking for feedback from anyone else who has done it.
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      12-09-2018, 03:36 PM   #4
gbalthrop
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Quote:
Originally Posted by Some Asian Guy View Post
I wouldn't use that seeing as how lead-acid batteries isn't on that list. You can get battery chargers for cheap, so why risk it? I use a Schumacher battery charger I got from a pep boys for $25.
+1

You overpaid, you can get one for $22.49 today (but that's NOT "trendy" or "pseudo-hi-tech" enough for many BMW owners).
https://www.pepboys.com/schumacher-s...274?quantity=1

Pep Boys is probably discontinuing that model 'cuz people want to pay a LOT more for the pseudo-tech $100+ stuff.

EDIT: If it appears too good to be true, it's probably false. I read that Pep Boys Schumacher product description too fast -- thought it said 6A to 1.5A automatic, but NO, it's basically just a trickle charger which is NOT what OP needs. Looks like the lowest price fast/automatic charger they carry is $63:
https://www.pepboys.com/schumacher-1...319?quantity=1

I had checked HFT several days ago & noticed that they no longer carry their $30 model that does 6A to 2A (which I have used for years). It seems like charger prices are going crazy. Is it "pseudo-tech" market frenzy, or "Tariff-Man"?

George

Last edited by gbalthrop; 12-09-2018 at 03:53 PM..
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      12-09-2018, 06:45 PM   #5
mweisdorfer
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Quote:
Originally Posted by carguy138 View Post
Thinking about ditching my JB4 and trying MHD. I currently have one of the BMW battery charger/tenders but the charging max amperage is 1.25amps.

I was wondering if it would be possible to safely use a high end RC car battery charger during the flash process. Duratrax Intellipeak Ice (cost around $130 and $50 for a DC power supply).

Here are the charger specs and a link to the manual. It doesn't mention anything about specifically charging lead batteries, only NICD/NIMH/LIPO/LION.

I would think with a 6amp charge on 11.1v lipo charge profile, I should be fine? I can monitor battery voltage on the charger and will shut off it it goes about a predetermined threshold (say 14.5v).

http://manuals.hobbico.com/dtx/dtxp4170-manual.pdf

Input Voltage:
11-15V DC

Battery Types, # of cells:
1-10 Nickel-Cadmium cells (1.2 - 12.0V NiCd)
1-10 Nickel-Metal Hydride cells (1.2 - 12.0V NiMH)
1-4 Lithium-Ion or Lithium-Polymer cells
(3.6 - 14.8V Li-Ion/Li-Po)

Battery Capacity Range:
100-9900mAh

Fast charge current:
0.1 - 8.0A (1C max for Li-Ion/Li-Po)

Fast charge methods:
linear, reflex, impulse and 4-step

Fast charge termination:
peak detection for NiCd and NiMH
constant current/constant voltage for
Li-Ion/Li-Po (cc/cv)
optional thermal cutoff for all battery types

Peak Sensitivity:
0 - 25mV adjustable

Trickle Charge Current:
0 - 500mA (n/a for Li-Ion/Li-Po)

Top-off Charge:
0 - 1000mA (NiMH only)

Discharge Current:
0.1 - 10.0A adjustable (2C max for Li-Ion/Li-Po)

Discharge Cutoff Voltage:
0.1 - 1.1V per cell NiCd & NiMH
2.5 - 3.7V per cell Li-Ion/Li-Po

Temperature Cutoff Range:
50 - 132° F

Cycle Count:
1-10 cycles (n/a for Li-Ion/Li-Po)

Cycle Cool-off Delay:
1-30 minutes adjustable

Battery Memories:
10 battery memories

Display Type:
8 x 21 LCD (168 characters max)

Graphical Displays:
graphs charge and discharge voltage curves

Output Connectors:
banana jacks (two adapter leads included)

Motor Break-in:
1.0 - 8.0V selectable, 1 - 180 minutes,
10A constant, 30A surge
I have this one for coding. Ista says my battery never drops below 14.5v ever....

https://www.homedepot.com/p/DEWALT-3...EC80/300385140

Dewalt makes a 70amp too, but it's $200.00
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