10-15-2025, 02:24 PM
Ears scratched.
These Voltage Boosters have been around for a few years at least. I was just avoiding re acquiring the '1800 watt' red one for its physical size, larger price, and what I assumed was unneeded capability.
There is a '600 watt' booster that is black with a bottom mounted heatsink that I do not own. I should see what its max input amperage is, if listed.
I do have the buck boost version of the black 600 watter, powering one of my 24v papst fans, but it kind of struggles on start up were my other buck boost does not.
The 12v DC nominal input being limiting factor, was not a factor until I made the BAK 45D pack and had cells which could be charged much faster.
Anyway the red booster opens up the potential for 10 amp, 420 watt bench charging, where the other boosters were 150 to 170 watts maxxed out, on 12v nominal input. The voltage potentiometer is not super sensitive at 42v either, like my other boosters. it is hard to not blow past the desired voltage and then difficult to dial it in precisely on the others.
The BAK 45D as 2 parallel can handle 26.4 amps charging as least for the low to middle part of the recharge, but my BMS says 10 amps max charge, as does my charge port. so that is the new limiting factor, not the booster.
I have used the new 1800 red booster on the bench at 170 watts and it barely got warm. I was only discharged to ~ 80% though so 170 watts did not last very long.
Hope your new battery arrives safe and was constructed with care from decent cells.
My electronics guru friend has a BT speaker that he loves to use, which I find surprising as he is an Audiophile, but convenience wins.
Its internal battery was just some junk 18650 and he said it would still last 6 hours when new, but that tapered to 3 recently.
He opened it up and saw there is room for 4 18650's, and if the little cradle and retaining posts are removed, 4 21700's can be made to fit.
So he ordered 4 EVE 58E, a very high capacity 21700 energy cell, 5700mah and 16.8 amp CDR. They are being sent here to me so I can spot weld them in parallel to a 1S BMS, and this should have 10x the battery capacity than the cell which is currently inside his BT speaker.
He said her ordered a few extras for me, that i am assuming are extra EVE58E . My only 21700 device is my Armytek headlamp, and I have a pretty Good Samsung 50S (5000mah, 25amp CDR) already in there, but at 10 amps max draw of this headlamp, the EVE 58E would probably run only a little warmer, but for ~15% longer.
I like to hang both my 90 degree headlamps from my cargo short Thigh pocket Via their deep carry clips, on our late evening / nighttime cruises.
The JP30 cell in my Sofirn HS40 is pretty good thrower on its own, but hanging the Armytek next to it is like the wide angle floodlight powerhouse.
These Voltage Boosters have been around for a few years at least. I was just avoiding re acquiring the '1800 watt' red one for its physical size, larger price, and what I assumed was unneeded capability.
There is a '600 watt' booster that is black with a bottom mounted heatsink that I do not own. I should see what its max input amperage is, if listed.
I do have the buck boost version of the black 600 watter, powering one of my 24v papst fans, but it kind of struggles on start up were my other buck boost does not.
The 12v DC nominal input being limiting factor, was not a factor until I made the BAK 45D pack and had cells which could be charged much faster.
Anyway the red booster opens up the potential for 10 amp, 420 watt bench charging, where the other boosters were 150 to 170 watts maxxed out, on 12v nominal input. The voltage potentiometer is not super sensitive at 42v either, like my other boosters. it is hard to not blow past the desired voltage and then difficult to dial it in precisely on the others.
The BAK 45D as 2 parallel can handle 26.4 amps charging as least for the low to middle part of the recharge, but my BMS says 10 amps max charge, as does my charge port. so that is the new limiting factor, not the booster.
I have used the new 1800 red booster on the bench at 170 watts and it barely got warm. I was only discharged to ~ 80% though so 170 watts did not last very long.
Hope your new battery arrives safe and was constructed with care from decent cells.
My electronics guru friend has a BT speaker that he loves to use, which I find surprising as he is an Audiophile, but convenience wins.
Its internal battery was just some junk 18650 and he said it would still last 6 hours when new, but that tapered to 3 recently.
He opened it up and saw there is room for 4 18650's, and if the little cradle and retaining posts are removed, 4 21700's can be made to fit.
So he ordered 4 EVE 58E, a very high capacity 21700 energy cell, 5700mah and 16.8 amp CDR. They are being sent here to me so I can spot weld them in parallel to a 1S BMS, and this should have 10x the battery capacity than the cell which is currently inside his BT speaker.
He said her ordered a few extras for me, that i am assuming are extra EVE58E . My only 21700 device is my Armytek headlamp, and I have a pretty Good Samsung 50S (5000mah, 25amp CDR) already in there, but at 10 amps max draw of this headlamp, the EVE 58E would probably run only a little warmer, but for ~15% longer.
I like to hang both my 90 degree headlamps from my cargo short Thigh pocket Via their deep carry clips, on our late evening / nighttime cruises.
The JP30 cell in my Sofirn HS40 is pretty good thrower on its own, but hanging the Armytek next to it is like the wide angle floodlight powerhouse.
![[-]](https://vandwellerforum.com/images/collapse.png)