MarsFire Sanyo Battery (18650)

old4570

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For review , the MarsFire Sanyo Battery ...
Supplied for review by Manafont(dot)com


What we have are Sanyo 2600 (18650) batteries with a protection circuit added and clear wrap used so we can see the cell used . It is regular practice to buy a cell , add a protection circuit and a attractive wrapper with your name on it , and in the last few years all sorts of names and claims have been added to such wrappers , offering prospective buyers what I like to call dumpster quality batteries (due to the incredibly bad cells used inside the wrappers - possibly out of a rubbish bin) . Well not always , sometimes it turns out you have a good battery .
So it is refreshing to see a change to this trend , clear plain wrapping so that we can see the cell used , and no outrageous capacity claims ...
Manafonts product description :

Sanyo - Protected 18650 High Capacity Rechargeable Battery
  • Sanyo brand you can trust
  • Rechargeable 18650 battery
  • High capacity
  • Protected
Now there is a simple honest claim , from what does appear to be a very honest battery . (Bear in mind that retailers usually pass on manufacturer supplied information)
Lets move onto the battery Dimensions :
Battery 1 , 68.6mm Long , 18.4mm in Diameter
Battery 2, 68.5mm Long , 18.4mm in Diameter


Testing:
The first thing was to do a direct comparison against a unprotected Sanyo 2600 battery to see if the protection circuit hampers the excellent discharge capability of the Sanyo 2600 .
To this end I used 3 XM-L flashlights , one being equiped with my insane Manafont supplied 3 mode XM-L P60 drop in , which is a real power hog !
2nd part of the testing is discharging the batteries for capacity , now I have do admit to stuffing up here , I forgot to check the Turnigy to make sure it was calibrated correctly , which it was not , so the results for the 1A test are on the low side as the charger terminated too early (Charger was reading battery voltage 3 tenths too low , so terminated at 3.3v rather than 3v) I really dont have time to re-run the 1A capacity test (apologies) . But all subsequent discharges have been set up correctly to compensate for the error in the Turnigy charger.

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Discharge results , as can be seen the MarsFire batteries have done extremely well , 5 amps and 5.3 amps with the manafont P60 drop in , and if memory serves , the unprotected Sanyo 2600 is the better of two Sanyo 2600's I own . And honestly , at this level , the variation simply comes down to individual cells . And in the lights which are regulated to 2.8A the performance is right on the money . A rose by any other name ! , in this case MarsFire .
Sanyo 2600 Test from a while back ! [ resulted in 2471mAh @ 1A ] , so looks like these are right on the money if not better than previous cells I got .




b2.jpg

Hmmm , interesting , I used a faster charger to charge cell 1 , and it returned a lower discharge result ...
Im going to have to repeat that , and charge the battery much slower ...
But in any-ways :
Look like genuine Sanyo cells , the batteries have performed well , and I personally do like the 18650 Sanyo batteries .
Id like to thank Manafont for the opportunity to test these batteries , and I hope the information is useful for any prospective buyers .

OK a bit of an update : I recharged cell 1 @ 300mAh last night and it returned 2151mAh @ 3A discharge , hmmm , a 51mAh improvement ..
I might repeat that and see what happens ..
Did try an experiment a while back with charge rates , might continue on that path with this cell ...

UPDATE INFO:
OK been very busy testing these batteries , last but not least :
Overcharge and over discharge protection results ....
Overcharge seems to cut in real early , one battery @ 4.2v and the other 4.21v
Testing overcharge ? Simple , I have a charger that charges to 4.35v [ Samsung 30A ] , so by placing the battery in the bay that goes to 4.35 I can see where the overcharge protection cuts in , simple ...
Over discharge , ok seems to cut in around 2.3v , Sanyo are rated to 2.75v , so perhaps a little generous ...

 
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Helmut.G

Enlightened
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Nov 28, 2007
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731
Location
Germany
Did you test the protection circuit, does short circuit cutoff work, does over(dis)charge cutoff work?

What is the mechanical stability of the batteries' top and the bottom like?
 

zer0ne

Newly Enlightened
Joined
Mar 22, 2009
Messages
43
There are a few sellers in Ebay too that is doing the same for Sanyo and Panasonic cells too...but I think these cells are not capable of 5A discharge.
 

old4570

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Messages
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There are a few sellers in Ebay too that is doing the same for Sanyo and Panasonic cells too...but I think these cells are not capable of 5A discharge.

Hmmm , not many flashlights capable either ...

If you buy a SST90 or something , then ? I stopped at 3A as its a reasonable expectation from the battery .
+ I did test for discharge ability , and one pulled 5A and the other 5.3A , though I did not try for a sustained discharge at this level (via - balance charger)

Protection circuit - will test today ! All this takes time , lots of time .. Be nice to be paid by the hour ! :thumbsup:

/* 1A discharge 2.5hours x 2 = 5 hours
Recharge with regular chargers after discharge , about 10 hours
Thats about 40Hours so far , lets call it $20 an hour , some one can PP me $800 */ :ohgeez:

Joking aside , not a bad battery .. I did test overcharge protection , and it cut in right on the money at 4.2v with one battery ...(the other might be slightly higher 4.21v)
I will try and see where the discharge cuts in , Sanyo is supposedly OK to discharge to 2.75v or something so I will set the discharge to 2.5v and see
 
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old4570

Flashlight Enthusiast
Joined
Feb 15, 2009
Messages
2,891
Location
Melbourne - Australia
UPDATE INFO:
OK been very busy testing these batteries , last but not least :
Overcharge and over discharge protection results ....
Overcharge seems to cut in real early , one battery @ 4.2v and the other 4.21v
Testing overcharge ? Simple , I have a charger that charges to 4.35v [ Samsung 30A ] , so by placing the battery in the bay that goes to 4.35 I can see where the overcharge protection cuts in , simple ...
Over discharge , ok seems to cut in around 2.3v , Sanyo are rated to 2.75v , so perhaps a little generous ...
 
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