hello! does anyone have any idea if you need another special charger to charge batteries over 2500mha to Ni-Mh 1.2v rechargeable batteries? I use Ever Activ UC-800 and with 2500mha batteries it charges perfectly. I tried to get one with a higher mha (3000,3900,4900) and it seems to charge in a maximum of an hour and when I put them on and turn the volume up, it doesn't last more than 10 minutes.
baterry roland fr4x
- Thread starter timo
- Start date
Ventura
Been here for ages!
a charger is a charger.. a battery with higher capacity just
takes longer to charge
the power rating of a charger may indicate if it can do
more batteries at once, or faster, or uses a switching system
to charge faster safely as opposed to steady voltage/current
the problem you are having can have a number of reasons
1: some battery companies lie about rated capacity
you can have one bad cell in a bunch of good ones so
it drops the total voltage of the pack below the Roland's threshold
and it assumes the battery pack is depleted and shuts off
takes longer to charge
the power rating of a charger may indicate if it can do
more batteries at once, or faster, or uses a switching system
to charge faster safely as opposed to steady voltage/current
the problem you are having can have a number of reasons
1: some battery companies lie about rated capacity
you can have one bad cell in a bunch of good ones so
it drops the total voltage of the pack below the Roland's threshold
and it assumes the battery pack is depleted and shuts off
The problem is that I bought 3 sets of batteries as I said, 3000, 4900 and 5500 1.2v Ni-Mh and the same thing, I thought it was the charger's fault, but with Batmax 2500mAh batteries it charges perfectly and the batteries last about 4-5 hours, but I wanted some with a higher capacity and longer lasting
Ventura
Been here for ages!
borrow an old charger for niCad batteries..
these old ones are just trickle charge type
and try that on the new batteries overnight
also, after the the pack stops working, test each battery
with a meter to see if they are all really depleted
personally i have never heard of or seen NiMh AA size
in 4900 and 5500 or even close to it.. too good to be true ?
these old ones are just trickle charge type
and try that on the new batteries overnight
also, after the the pack stops working, test each battery
with a meter to see if they are all really depleted
personally i have never heard of or seen NiMh AA size
in 4900 and 5500 or even close to it.. too good to be true ?
I use the batmax ones and I go on the charger.
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The problem is the batteries. There are very few AA batteries that reach 2800mAh, much less some of the highly suspect mAh rated batteries you mention.
Stick to known good names like PowerEX or Eneloop.
Stick to known good names like PowerEX or Eneloop.
Batmax batteries are low quality batteries that generally never come close to their ratings. Do a Google on them as I have. 
For anything more than normal durations a custom battery will serve best.
For anything more than normal durations a custom battery will serve best.
Last edited:
cestjeffici
Active member
I timed it. It takes about two minutes to change the batteries in my FR4. Taking a two minute break every 4 hours kind of relaxes me. If I think the set in my FR4 won't last until I'm done playing I change them before I start to play. I have 4 sets of batteries and my charger can easily keep up with me. I enjoy the extra playing time instead of messing around with my equipment.
I
I envy you Jeff if you can play 4 hours without taking a break, and then going on after a two minute break. Even playing at home in my practice room I couldn’t do that. No way at a gig.
cestjeffici
Active member
Caps
Active member
Ratings over 2800 Mah are highly suspect. i would test each cell separately. I suspect you got some bad ones in there.
Known good ones are enelope, EBL and tenergy. There may be others but i know these are good.
Known good ones are enelope, EBL and tenergy. There may be others but i know these are good.
Those are not ratings that seem compatible with NiMH battery chemistry in AA format. Smart chargers will not be able to properly detect the end of charging. Dumb chargers (which provide a fixed low current for a fixed time that is known not to damage an already full battery) will stop too soon, but you could try using a dumb charger twice.
The most likely explanation, however, is not a different battery chemistry but a marketing hoax. Of course there are ways to achieve higher capacity at the cost of durability. Such a battery might deliver its stated capacity, if at all, just for a few times before significantly deteriorating and hitting lower capacities than quality batteries within a dozen charge cycles. In addition, such fast deteriorating batteries will not be properly monitored by smart chargers, leading to phenomena like you describe above where the charger declares the battery full long before it reaches its stated or at least feasible capacity.
