Compiled from Sony APR List Archives, slightly edited ============================================= Richard L Hess I ... searched through my heap of APR stuff. Two circuit boards had 1/2 A 3 V Lithium batteries on them. Better yet, there was a 2011 vintage Lithium battery in a DigiKey bag that I think Christopher Campbell gave me. It has a Panasonic BR-1/2AA in it. BR-1/2AAE5PN I rechecked and the boards do have 1/2 A not AA in them. The 1/2 A is a hair shorter and bigger in diameter than the 1/2 AA. The 1/2 AA is rated at 1 AH. They are all 3 V. I think my 3.6 V battery memory is coming from the more nightmarish recorder battery the NiCd / NiMH rechargeable in the Studer A810 that also holds the presets. I've had far more of those go bad than I've had the APR's lithiums. In fact, I've never changed a lithium in the 15 years I've had APRs and I've never seen a memory reset. So, with that said, the part is available from DigiKey.COM, but NOT from DigiKey.CA. Hmmm. It is $4.89 for one and $44.03 for ten. Mouser has them as well, but won't ship them to Canada, eh. Neither appears to have the 1/2 A cells anymore. Digi Key Part Number P028-ND and P029-ND are button cells with tabs that could be made to fit in the board, I suspect. There is a second hole that is outside the first so a slightly longer cell will easily fit. They are $4.41 and can be shipped to Canada, apparently. There are several others in the range. Search for 3 V 1 Ah. So, the batteries can be obtained. ============================================= Christopher Campbell I posted detailed information about replacing APR batteries back on 9/21/2014, under the thread titled "Error code E003 when booting APR-5002." I am reproducing it here in its entirety. 覧覧覧覧覧覧覧 Hello all, I have been traveling and so am a bit late to this discussion. The short answer is that Richard is correct, and the new battery he has in hand is an extra I purchased when I replaced one in my first APR-5003V in 2010. At the time, out of curiosity I tested the original battery, manufactured in 1988 and removed in 2010, on a ZTS battery tester, and the 22-year-old battery didn't even register on the 10% segment of the display, and yet that APR was still holding its presets before the replacement, so the originals are good for quite a run. In 2011, I replaced the battery in my second APR-5003V, and both the new batteries have continued to work perfectly. I'll freely confess that even though it's easy to write down the alignment parameters for each preset, I like knowing that the memory registers are properly charged. My notes as to the original and replacement models, and for replacing the batteries follow. The notes may seem excessively detailed, but I was quite new to this sort of work when I started restoring my recorders. ----- Christopher Campbell http://cbcampbell.com ----- 1. Original battery: Panasonic BR-1/2A battery cell size: 1/2 A voltage: 3 V capacity: 650 mAh termination style: solder tab date code: 821, decodes as 1988 - February , 2/1988 measured dimensions: length = 21.6 mm, diameter = 16.5 mm location: CPU circuit board, component: B1, Sony manual, page 9-28 lead spacing: PTH holes for solder leads spaced 25.5 mm apart ----- 2. Replacement battery: Panasonic BR-1/2AAE5PN Digi-Key part number: Panasonic P631-ND http://www.digikey.com/product-search/en?KeyWords=BR-1%2F2AAE5P&WT.z_header=search_go specified dimensions: 14.5 x 25.2 mm voltage: 3 V capacity: 1000 mAh (note increase over the original 650 mAh of the original) ----- APR-5003V lithium battery replacement notes, 2011-10-31 1. remove top rear cosmetic panel (surrounding reel tables) by removing 2 screws at rear corners 2. remove 2 screws at back of keypad/LCD display (note loop terminal fixed with star washer over plastic tab/ear at right rear) 3. lift up keypad circuit board, move to side and rear to expose CPU circuit board 4. at back right, disconnect folded harness CNJ422 (brown wire to APR back) 5. at left of keyboard assembly, disconnect harness 433 to keyboard (holding keyboard in normal orientation, keys up, the harness slides in with the numbers 433 visible, and the clamping mechanism on the bottom 6. at back, disconnect harness CNJ420 (brown wire to APR right), by pressing down on the levers at the outside edges 7. at the extreme back, disconnect harness CNJ421 (brown wire to APR right), by pressing down on the levers at the outside edges 8. at back left, disconnect harness CNJ950 (purple wire to APR front) 9. remove 5 screws securing CPU circuit board (one in center), remove board 10. desolder old battery and replace with new, carefully noting polarity. New batteries have slightly different dimensions between the leads, so it was necessary to trim their length, and bend them slightly before soldering 11. replace all cables and components, and test for storage of memory parameters ============================================= Scott Phillips LOL.... Christopher, you are the detail orientated one for sure! My compliments! Very helpful for those who have never done this sort of thing before. For sure, anyone changing this battery should be very careful, particularly with the soldering. This is NOT a difficult repair at all for those with experience and good soldering skills... but if you are unsure of your soldering skills, remove the board and have a qualified tech do the replacement for you. Having a part number and source for the battery is a real plus for everyone, thanks! I completely agree, everyone should write down ALL of the alignment and head compensation settings before you start this battery replacement. It may save you a lot of time, frustration, and grief later..... and a last thing to remember is that this is a processor based circuit board. It won't like getting hit by high static electricity discharges. Stay grounded yourself when you handle it and use an antistatic plastic bag if you are going to take the board for someone else to install the battery.