burns3016 Posted January 23, 2006 Report Share Posted January 23, 2006 Hi ! Does anybody know/understand why the gumstick style batteries aren't made with capacities similar to the AA rechargeables ? (eg. up as high as 2500mah) ? I have seen them as high as 1750mah. Surely it can't be because the MD-units wouldn't handle them ? As you can use a seperate wall-charger eg. SONY BC-7DC2. Quote Link to comment Share on other sites More sharing options...
greenmachine Posted January 23, 2006 Report Share Posted January 23, 2006 (edited) 'Gumstick' batteries are about 3/4 to 4/5 the physical volume of AA's, which highest capacities are about 2500-2800mAh to date, so about 2000mAh or more should be possible for gumsticks in theory. Maybe the rectangular shape isn't as effective? Maybe they're just not 'up to date'? Edited January 23, 2006 by greenmachine Quote Link to comment Share on other sites More sharing options...
pauljones52 Posted January 23, 2006 Report Share Posted January 23, 2006 If the batteries last longer then you will not need to recharge them as often, so their overall lifespan will be greater. So sony would have to wait an extra year or so to sell you the replacement battery, hummm : Quote Link to comment Share on other sites More sharing options...
sebastianbf Posted January 23, 2006 Report Share Posted January 23, 2006 (edited) If the batteries last longer then you will not need to recharge them as often, so their overall lifespan will be greater. So sony would have to wait an extra year or so to sell you the replacement battery, hummm : That's paranoia man! lol Edited January 23, 2006 by sebastianbf Quote Link to comment Share on other sites More sharing options...
burns3016 Posted January 24, 2006 Author Report Share Posted January 24, 2006 'Gumstick' batteries are about 3/4 to 4/5 the physical volume of AA's, which highest capacities are about 2500-2800mAh to date, so about 2000mAh or more should be possible for gumsticks in theory. Maybe the rectangular shape isn't as effective? Maybe they're just not 'up to date'?I agree with your assessment of the battery's physical volume & therefore it's capacity. But if as you say, they can in theory hold up to appox.2000mah, then why aren't we seeing them manufactured at this capacity ? I know there was a batch of SONY's at 1750mah, but where did they go ? Where they problematic ? And also, somebody mentioned in another thread that eBay sells many untrustworthy SONY gumstick batteries. Do you know if this is a common or well-known fact ? And if yes, are they potentially dangerous for the MD-Unit ? I ask because I have recently spent approx. $100 Australian dollars buying sealed & packaged SONY 1400mah gumstick batteries. I managed to acquire 8 of these SONY 1400mah batteries for this total price (included is a charger - the SONY BC-7DC2) & have since read this claim in another thread. Now I am worried ! Quote Link to comment Share on other sites More sharing options...
greenmachine Posted January 24, 2006 Report Share Posted January 24, 2006 And also, somebody mentioned in another thread that eBay sells many untrustworthy SONY gumstick batteries. Do you know if this is a common or well-known fact ? And if yes, are they potentially dangerous for the MD-Unit ? I ask because I have recently spent approx. $100 Australian dollars buying sealed & packaged SONY 1400mah gumstick batteries. I managed to acquire 8 of these SONY 1400mah batteries for this total price (included is a charger - the SONY BC-7DC2) & have since read this claim in another thread. Now I am worried !Speaking from experience, having a large number of rechargeables is not the best idea because of their relatively high self-discharge / degradation when unused. One or two should be plenty for single cell operated devices. If regularily used / maintained, they will stay in good condition for a long time to come. It's more difficult to maintain a large quantitiy of batteries properly. Quote Link to comment Share on other sites More sharing options...
burns3016 Posted January 24, 2006 Author Report Share Posted January 24, 2006 Speaking from experience, having a large number of rechargeables is not the best idea because of their relatively high self-discharge / degradation when unused. One or two should be plenty for single cell operated devices. If regularily used / maintained, they will stay in good condition for a long time to come. It's more difficult to maintain a large quantitiy of batteries properly. What about if you left them (ie.the extra rechargeables) untouched - ie. as new & packaged (or opened but untouched) - ie. as if they were sitting in the shop somewhere waiting to be sold. Surely this would not pose a problem ? Wouldn't it be just like having the battery in your house rather than in the store ? OR is this assumption wrong ? Do they expire ? That is, is my assumption wrong because retailers need to renew their shelf-stock of rechargeables after a certain period of time ? Sorry to over-complicate the situation, I just wondering out aloud ! Quote Link to comment Share on other sites More sharing options...
Spare Tire Posted January 25, 2006 Report Share Posted January 25, 2006 I've been scammed on fake sony gumsticks before and i can tell you they ARE dangerous for your unit. Once i charged mine inside the unit, it was cheap quality, the internal separator of the battery was probably punctured, so that when i charged, it was shorting the battery inside and instead of charge separation it was just "cooking" the battery. When the battery cooks, it inflates. I left it overnight, the next morning my unit played for like an hour and then said low battery. I tried to take the battery out but it was so inflated it didn't come out from my MD.I got it out after great effort and a big sweat. I tell you, really dangerous. If it had expanded more, it would have cracked my unit open, or exploded altogether. Now i charge my batteries with an external charger just in case.Don't trust those chinese fakes. Even if they are a tenth of the price, it's not worth risking. Quote Link to comment Share on other sites More sharing options...
burns3016 Posted January 25, 2006 Author Report Share Posted January 25, 2006 I've been scammed on fake sony gumsticks before and i can tell you they ARE dangerous for your unit. Once i charged mine inside the unit, it was cheap quality, the internal separator of the battery was probably punctured, so that when i charged, it was shorting the battery inside and instead of charge separation it was just "cooking" the battery. When the battery cooks, it inflates. I left it overnight, the next morning my unit played for like an hour and then said low battery. I tried to take the battery out but it was so inflated it didn't come out from my MD.I got it out after great effort and a big sweat. I tell you, really dangerous. If it had expanded more, it would have cracked my unit open, or exploded altogether. Now i charge my batteries with an external charger just in case.Don't trust those chinese fakes. Even if they are a tenth of the price, it's not worth risking.Many thanxz Spare Tire. I will take note. I have no intention of ever charging one of the Chinese batteries in my unit. I think what I will do is charge them in the charger & try them in the unit to see what type of a "life" I get from them. OR do you recommend not even using them at all ? Quote Link to comment Share on other sites More sharing options...
tekdroid Posted January 25, 2006 Report Share Posted January 25, 2006 Many thanxz Spare Tire. I will take note. I have no intention of ever charging one of the Chinese batteries in my unit. I think what I will do is charge them in the charger & try them in the unit to see what type of a "life" I get from them. OR do you recommend not even using them at all ?I hope they're not faking the Li-Ion LIP-4WM, 'cause I was planning on getting a spare from ebay.What has me more curious about capacities is seeing mobile phone batteries like the Sony Ericsson BST-35 Li-Polymer battery only have a capacity of 700mAh (original Made in China, btw)These things are far larger than gumsticks and supposedly have better chemistry than Ni-MH. Quote Link to comment Share on other sites More sharing options...
greenmachine Posted January 25, 2006 Report Share Posted January 25, 2006 I hope they're not faking the Li-Ion LIP-4WM, 'cause I was planning on getting a spare from ebay.What has me more curious about capacities is seeing mobile phone batteries like the Sony Ericsson BST-35 Li-Polymer battery only have a capacity of 700mAh (original Made in China, btw)These things are far larger than gumsticks and supposedly have better chemistry than Ni-MH.Such batteries usually have higher voltages - calculate it to (m)Wh and it'll be the same or superior.700mAh - 2.4V and 1400mAh - 1.2V can store approx. the same amout of power for example. 700mAh - 3.6V would be superior. Quote Link to comment Share on other sites More sharing options...
tekdroid Posted January 25, 2006 Report Share Posted January 25, 2006 Such batteries usually have higher voltages - calculate it to (m)Wh and it'll be the same or superior.700mAh - 2.4V and 1400mAh - 1.2V can store approx. the same amout of power for example. 700mAh - 3.6V would be superior.Ah of course! Cheers.Seems like watt-hours would be a far more sensible measurement, btw. Makes me wonder why they standardised on just the current flow rather than actual power. Quote Link to comment Share on other sites More sharing options...
Spare Tire Posted January 25, 2006 Report Share Posted January 25, 2006 Many thanxz Spare Tire. I will take note. I have no intention of ever charging one of the Chinese batteries in my unit. I think what I will do is charge them in the charger & try them in the unit to see what type of a "life" I get from them. OR do you recommend not even using them at all ?You can use them, there was one that came with a player i bought from ebay and it worked okay. It's just that it seems to discharge faster than original ones when not in use. Overall, they'll last you for not very long. And i don't think it's worth it. You can find genuine ones that cost just as cheap than getting fake ones from ebay (with their outrageous shipping prices).Try here: http://www.goldmine-elec-products.com/prod...aitem=3&mitem=5 Quote Link to comment Share on other sites More sharing options...
burns3016 Posted January 26, 2006 Author Report Share Posted January 26, 2006 You can use them, there was one that came with a player i bought from ebay and it worked okay. It's just that it seems to discharge faster than original ones when not in use. Overall, they'll last you for not very long. And i don't think it's worth it. You can find genuine ones that cost just as cheap than getting fake ones from ebay (with their outrageous shipping prices).Try here: http://www.goldmine-elec-products.com/prod...aitem=3&mitem=5Thanxz again Spare Tire ! The problem is that I have about 8 of these batteries ! Perhaps they are not knock-offs ? Unlikely though ! I will certainly never charge them in my unit. I will stick to the wall charger that I purchased seperately. Quote Link to comment Share on other sites More sharing options...
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