Maha MH-C9000 SUPPORT / FAQ - continuation

[Mr Happy]

Thanks for all feedback about this problem, but everyone concentrates on negative end contact problem, but its not the case here. Negative end contakt is fine and very steady, its the positive end that gives problem.

Compare the shape of positive tans on those two pictures (no big hill in the middle ). On mine there is nothing to hold call in place and it have a tendency to slide on tang upwards and loosing contact there. This is not a prolem with negative end. Rotating pushing batteries up a bit, nothing makes 100% sure that you wont loose contact. Even stomping on the floor with foot can make it stop charging :/

I think you should communicate your problems directly to Maha and see if they can help. If you have a faulty unit they may replace it.

 

[Tuikku]

I found this MH-C9000 from eBay for ~70$ including shipping to Finland.
Is eBay smartest place to get it? Must have worldwide shipping with decent price.

 

[Mr Happy]

I found this MH-C9000 from eBay for ~70$ including shipping to Finland.
Is eBay smartest place to get it? Must have worldwide shipping with decent price.

Maha has a worldwide distribution network. You should be able to find it in Europe or even Finland without having to resort to eBay. You might try contacting Maha to locate a vendor nearest to you.

 

[Tuikku]

Maha has a worldwide distribution network. You should be able to find it in Europe or even Finland without having to resort to eBay. You might try contacting Maha to locate a vendor nearest to you.

Thanks, I´ll try to get in touch with Maha.
Still betting it will cost around 100$+ in here, if even available :sigh:

 

[Mr Happy]

Thanks, I´ll try to get in touch with Maha.

Not quite Finland, but one step away: http://www.mahaenergy.se/

 

[Turbo DV8]

The C9000 I received from NewEgg recently has both the improved AAA negative tang, and the positive contact looks like the one above, without the "dividing" ridge between the two sets of dots. The ridge would tend to hold the AAA cell in place between it and the lower set of dots without having to press it so hard that it is actually under the two lower dots to hold it in place. I did note that when inserting AAA cells, it seemd a good bit of force was needed to make them feel secure, but now when i get home from work I will check my cells to be sure they were not damaged. Will report back. Point is, it is looking like perhaps the newest versions have an improved AAA negative contact , but a worse positive contact for AAA. If this damages my AAA cells also, I will be speaking to Maha about this, my second attempt to give the C9000 a chance.

 

[Tuikku]

Not quite Finland, but one step away: http://www.mahaenergy.se/

Thanks for link. I found one retailer with price on webpage - 92$ + shipping.
About the same in Germany + shipping.

 

[fishinfool]

Aloha! I know that most people prefer to discharge their cells first before doing a break-in or refresh and analyze. My question is that is there anything wrong with discharging cells at 100ma other that it takes forever to do so? Thank you.

 

[SilverFox]

Hello Fishinfool,

Nothing wrong with that at all.

Tom

 

[fishinfool]

Hello Fishinfool,

Nothing wrong with that at all.

Tom

Thank you sir! lovecpf

 

[TakeTheActive]

...My question is that is there anything wrong with discharging cells at 100ma other that it takes forever to do so?

IMHO, you're OVER-THINKING this (new hobby of yours).

There's a proper time-and-place for Discharging @ 0.2C, 1.0C, 0.5C and 100mA - it all depends on what you're attempting to accomplish... :thinking:

 

[GAReed]

heed experiance; follow a masters advice and TTA's links... you won't be disappointed.
regards,
a noob

Thank you sir! lovecpf

 

[larcal]

Hello,

My apologies for posting this originally in the parent forum. Very negligent of me! I'm sure we all read at one time Nlee's Amazon review of this Maha, in which he says he could not charge several year old AA's that still had a 1000 mah capacity as measured on his LaCrosse. (His LaCross will charge them). This because the Maha rejects cells of a certain level of resistance, for some mysterious safety reason. Have you all found this to be true?. Maybe his maha was defective. Not talking about cells with a low voltage. Seems like the charger for me otherwise.

Thanks
Larc

 

[Mr Happy]

Hello,

My apologies for posting this originally in the parent forum. Very negligent of me! I'm sure we all read at one time Nlee's Amazon review of this Maha, in which he says he could not charge several year old AA's that still had a 1000 mah capacity as measured on his LaCrosse. (His LaCross will charge them). This because the Maha rejects cells of a certain level of resistance, for some mysterious safety reason. Have you all found this to be true?. Maybe his maha was defective. Not talking about cells with a low voltage. Seems like the charger for me otherwise.

Thanks
Larc

Hi, Welcome to CPF

:welcome:

Your question actually has been answered in the other thread, so it's best to continue there. If you ever post a question in the wrong place, just ask a moderator to move it. That's better than posting the same question in two different places.

 

[TinderBox (UK)]

Just bought one of these after the great reviews and details from this thread , it has an 0J0CA version number.

I am now doing a capacity test on some cheap 7dayshop re-brand AA 2100mah lsd battery.

I have previously done a capacity check on these using my Thunder AC6 and got a capacity of only around 1850mah at a 0.2c discharge rate, so not very good.

I will be interested in seeing the results from the C9000

Thanks

John.

 

[lee5079]

I just got my MH-C9000 last Friday and has been doing the Battery Charger Operator works for the last couple of days... Phew.. this hobby is really a weird one.

I get the charger with the thought of placing a bet on it that it could actually salvage some of my NiMH that failed pre-maturely especially like under 1 year of services. They were charged in combination of chargers, including Sanyo's smart charger that with refresh, Sony's smart charger, GP timer based charger and Duracell's Pile Charger ( which I suspected is a timer based charger with dual inline series charge ).

The 30++ batteries pool that I have including Powerexx, Sanyo, Sony & Duracell.

So far, only 4 out of them can be put into the charger and get them into running with the program and I have done them with R&A, Discharge, Cycle with only manage to crank up around 1800mAH from a 2500mA Powerexx. Minimum numbers of the batteries (around 5 out of the 30+ )are reporting HIGH after initial test but the remaining are in an Uknown stage.

When I put the battery / batteries into the slot, the charger recognized it and let me select the programming, but no matter which that i chosen, the slot will get "reseted" and back to square one asking me to program again like a new battery has been just inserted. It doesn't report HIGH nor any error nor doing any programmed activities but just kept reseting on the slot. Have tried the batterries in other slots with same behavior and putting a known good / new batteries will yield a good response and start the activities after the programming done.

My questions are.
- Anyone experienced the same scenario ?
- Am I getting a bad charger ?
- If it is not report HIGH and Not performming programmed activities.. are those batteries good or bad ? Can they be salvaged ?

Hoping some can elighten me on this.

Thank in advance,

Lee.

 

[Mr Happy]

I think the batteries where the slot resets without starting are worse than "HIGH".

It is generally quite difficult to do much to recover batteries once they have developed such high resistance. There is no way to get the resistance back into the normal range once this has happened. Most people consider such batteries "crap" and they either discard them or they relegate them to light duties such as remote controls.

The C9000 is much more useful for maintaining new batteries and keeping them in good condition. If you wish to stop your new batteries going bad the C9000 is the perfect tool to help.

 

[MarioJP]

Speaking of internal resistance I still have those crap energizers, even though they are in bad shape interesting enough is the capacity is still useful to be used in a battery pack. I just look at them as rechargeable alkalines lol. Most chargers refuse to charge them but the la crosse gives me the capacities for these cells of 2000 out of 2200 rated capacities some are 2450 and 2500. But they all report back 2100.

and I have cycled them a few times seems to improve a bit. I don't think the charger is bad but rather the cells are going crap. You can try cleaning the contacts see if that helps but who knows. Maybe its time for those cells to be recycled?

 

[45/70]

Welcome to CPF lee5079! :thumbsup:

- If it is not report HIGH and Not performming programmed activities.. are those batteries good or bad ? Can they be salvaged ?

It has been a while since I had any cells demonstrate that behavior. Mr Happy is right, it is an indication that the cells are in really bad shape.

I realize you said you could not get any program to work, but did you try "DISCHARGE"? If you insert one of these cells and set the C9000 to discharge @100mA and it works, there may be some hope. I remember having some very old NiCd cells that behaved like that. I can't remember if they could be discharged on the C9000 though. If you can get a 100mA discharge to work, partial recovery may be possible. As Mr H alluded to however, the process is a lot of trouble and the chances for success are slim.

Dave

 

[Turbo DV8]

Yesterday my C9000 did an odd thing. I put a pair of cells on to cycle 2x. Both cells first cycle rendered 1700-ish mAh, but the second cycle of one cell returned around 200 mAh. A subsequent removal, reinsertion, discharge and R&A of the latter cell returned back in the 1700 mAh range. Just a case of bad contact? Or...?