any ideas guys 30v battery  - Page 1
Forum section: electronics / general

author: lukem9962
author_rank: Newbie
timestamp: March 29, 2013, 12:46:19 am
content: hi i have a old radiation meter i was messing with and the battery is dead it takes 1x 1.5v aa i think 1x30v like the pic and a 15v i cant get 30 or 15v batterys anymore so any ideas how to replace these ? cheers for any ideas luke

author: NiHaoMike
author_rank: Super Contributor
timestamp: March 29, 2013, 12:48:42 am
content: Maybe a stack of button cells?

author: lukem9962
author_rank: Newbie
timestamp: March 29, 2013, 12:54:25 am
content: what about the size difference ?

author: senso
author_rank: Frequent Contributor
timestamp: March 29, 2013, 01:13:54 am
content: Custom pcb with the correct dimensions, single cell LiPo and a boost converter?

author: lukem9962
author_rank: Newbie
timestamp: March 29, 2013, 01:14:43 am
content: Quote from: senso on March 29, 2013, 01:13:54 amhow would one do that ?

author: PeterG
author_rank: Frequent Contributor
timestamp: March 29, 2013, 01:17:57 am
content: The battery you are after seems to be still available. It is known as Eveready 413. It is expensive tho.http://www.ebay.com/itm/Eveready-battery-30-volts-/330867601106?pt=Batteries_Chargers&hash=item4d093eeed2Regards

author: lukem9962
author_rank: Newbie
timestamp: March 29, 2013, 01:21:42 am
content: Quote from: PeterG on March 29, 2013, 01:17:57 amallright ill check it out im after all options also it takes a 15v what could that be ? heres a link to te same meter i havehttp://www.civildefensemuseum.com/southrad/brit-meter-2.html

author: Moshly
author_rank: Regular Contributor
timestamp: March 29, 2013, 01:24:29 am
content: 3 X 9v maybe 27V is enoughThis site lists a lot of equivalent types ->http://www.smallbattery.company.org.uk/sbc_a413.htm

author: edpalmer42
author_rank: Super Contributor
timestamp: March 29, 2013, 03:44:57 am
content: Quote from: lukem9962 on March 29, 2013, 12:46:19 amHook it up to a couple of power supplies and measure the current drain for each battery. Based on that, you can decide what type of battery stack is appropriate. You could use coin cells, button cells, cylindrical cells (small 12 or 15 volt batteries are common). I recently pulled apart an ordinary 9V alkaliine battery and found 6 nice little cylindrical cells smaller than AAA. If 20 or 10 of those would fit, that could work for you.As PeterG said, there's one on the auction site. Actually his link is for a set of two, but the seller also has individual ones. I see that there's even an alkaline version but it's more money than the carbon-zinc version. It would probably last a lot longer though.http://www.ebay.com/itm/Exell-413A-Alkaline-30V-Battery-NEDA-210-20F20-BLR123-ER413-/390478377695Ed

author: lukem9962
author_rank: Newbie
timestamp: March 29, 2013, 04:11:23 am
content: Quote from: edpalmer42 on March 29, 2013, 03:44:57 am

author: gtc
author_rank: Newbie
timestamp: November 10, 2017, 11:33:41 am
content: Necrobumping this thread for the record:Google 'Neda 210 battery' for a modern replacement for the Eveready No 413 battery of yore. Very expensive, but same packaging as the 413.

author: Ian.M
author_rank: Super Contributor
timestamp: November 10, 2017, 12:10:57 pm
content: At that sort of pricing, I think I'd make up a battery pack. For rarely used equipment or if you want a long shelf life a boost converter isn't ideal as its hard to get the quiescent current low enough. 3V primary Lithium CR2025 cells look to be the best bet - they have dimensions that will let you get 30V within the same volume as the original battery with comparable mAH. Take a block of hardwood or Paxolin or similar of suitable dimensions*, and drill two 20mm holes through it each to hold a stack of five CR2025 cells. Alternatively 3D prnt a holder. If you use hardwood boil it in Paraffin wax to drive out moisture and wax impregnate it to reduce leakage. Then take three thin brass strips, indent the end of two of them to form the end contacts, and form them into a L shape. Bow the other one to form the bridge contact to join the two stacks of cells in the middle. Screw them to the block with countersunk screws, insert the cells, and swivel the bridge contact to hold them in, then cover in heatshrink. It should take under an hour and $10 of materials (assuming dollar store CR2025 cells). When it dies again, slit the heatshrink to replace the cells, then re-cover with new heatshrink.* About 2mm less thickness and width than the original to allow for the heatshrink and brass strips. Length is the same.

author: Old Don
author_rank: Regular Contributor
timestamp: November 10, 2017, 12:18:35 pm
content: 30volts? My memory was of a 22 volt battery of that size/shape that was used in an portable tube AM radio we had back in the '50's/60's. Guess it's a sign of one more brain cell that's gone off. I remember dissecting one of them back them and is was just a stack of carbon/zinc dry cells.There's some 12 volt dry cell batteries that appear to be the size of an "AA" cell that might be adaptable to make up a 24 or 36 volt pack. See:https://www.amazon.com/27A-Alkaline-Cell-Battery-Package/dp/B01LZVP821

author: amyk
author_rank: Super Contributor
timestamp: November 10, 2017, 12:36:26 pm
content: Just like the 90v(!) batteries which used to be available for radios, these are designed for low-current, high-voltage, so a stack of button cells would probably be OK.

author: Ian.M
author_rank: Super Contributor
timestamp: November 10, 2017, 12:51:19 pm
content: You are thinking of the Eveready 412 (NEDA 215) 22.5V battery commonly used for AVO meters to power the high resistance ranges. I belive they are about 180mAH. An A27 12V battery would have a small fraction of its capacity so would be unsuitable for building a replacement pack.The 412 is a bit smaller but the approach above would work with two stacks of four CR2032 cells to give 24V. If the device cant take 24V, either leave out one cell for 21V or add a red LED with Vf in the 1.6V to 1.8V range to drop the terminal voltage enough. Bend its leads out and push fit it in a hole between the two CR2032 stacks to use it as the bridge strip.A note on capacities: The Ampere Hour capacity of a battery is heavily dependent on the chemistry, active volume and the nominal voltage. If you replace prismatic cells with cylindrical or button cells of the same chemistry, you loose a lot of capacity due to the much lower volume of active chemicals because they don't pack into the exterior dimensions as well. The only way to avoid that is to go to a higher energy dimension chemistry, e.g. Lithim cells.

author: MK14
author_rank: Super Contributor
timestamp: November 10, 2017, 01:17:45 pm
content: Warning:This thread is from2013The OP was lastactive about two years ago!

author: Ian.M
author_rank: Super Contributor
timestamp: November 10, 2017, 01:33:47 pm
content: Quote from: MK14 on November 10, 2017, 01:17:45 pmYes, but:Quote from: gtc on November 10, 2017, 11:33:41 amIts better to 'bump' an old topic than to start a new one for the *SAME* question.

author: MK14
author_rank: Super Contributor
timestamp: November 10, 2017, 01:38:45 pm
content: Quote from: Ian.M on November 10, 2017, 01:33:47 pmThat is maybe a bad idea. Because people can waste time, replying to OP's, that have long left the forum.E.g. Me, as I was potentially about to reply, but fortunately, discovered it was ancient/necro, before replying.But anyway, it is a matter of opinion, and mine is that old necro threads, should be left alone. Unless it is a general, long term subject area. Such as which PCB software to buy or something.Some forums automatically lock threads like these, after about 3 months.But I concede, opinions do vary about this issue, and I'm in two minds myself. There are advantages to both solutions. Locking or leaving open.Maybe if the forum could at least more clearly tell users that the thread is a big NECRO, then the posters can make their own minds up ? (I think some forums do warn users, maybe there is a plugin ?)

author: Ian.M
author_rank: Super Contributor
timestamp: November 10, 2017, 02:18:06 pm
content: This forum already has that feature.

author: MK14
author_rank: Super Contributor
timestamp: November 10, 2017, 02:42:17 pm
content: Quote from: Ian.M on November 10, 2017, 02:18:06 pmYou're right about that, and I didn't know that function was already enabled/put-in.But what I (ideally) meant, was a warning for all posts, AFTER the first person to Neco the thread.But the problem with that, is there are many genuinely old, necro like threads, on this forum. Such as "Show your desk" or "show your cat", etc etc.So it would be a nuisance, if those threads continually warned people of their age.So I'm not sure what the best solution is.tl;drIn all fairness, I think the "necro" problem, is something which causes headaches on many forums, as well. Maybe it is just something that us forum users, have to accept. If we want to use forums.

author: G7PSK
author_rank: Super Contributor
timestamp: November 10, 2017, 04:21:53 pm
content: 15 volt and 30 volt batteries like the one shown were used in hearing aids. Took many of them apart in the 60's the batteries were a stack of flat cells similar to the 9 volt ones of the day.