Which replacement battery is compatible with a LEOCH DJW12-7 used in an APC BV650I-GR UPS? The original 12V 7Ah battery has swollen - can I replace it with a higher-capacity 9Ah battery that fits the same dimensions and weight? How do I choose between similarly sized models with different part numbers (for example: ИБП CSB HR 1234W F2, ИБП CSB UPS 12460 F2, ИБП Delta HR 12, ИБП Delta HR 12-34 W) that differ mainly in internal resistance and discharge current? Which specifications must match (voltage, Ah rating, dimensions, terminal type, internal resistance, maximum discharge current) and what else should I check to ensure safe compatibility?
Yes, you can replace the swollen Leoch DJW12-7 12V 7Ah battery in your APC BV650I-GR UPS with a higher-capacity 9Ah sealed lead-acid battery, provided it matches the exact dimensions, F2 terminal type, and key electrical specs like internal resistance under 0.1Ω and maximum discharge current of at least 30A. Top compatible options include the CSB HR1234WF2 (9Ah, high-rate discharge), CSB UPS12460F2 (9Ah, UPS-optimized), or Delta HR 12-34W (9Ah, strong burst current up to 120A), all of which fit the APC BV650I-GR’s compartment and extend runtime by about 25-30%. Always verify physical fit and charger compatibility to avoid issues—more on that below.
Contents
- Original Leoch DJW12-7 Specs in APC BV650I-GR
- Upgrading to 9Ah: Is It Safe?
- Must-Match Specifications for Compatibility
- Comparing CSB HR1234WF2, CSB UPS12460F2, and Delta HR 12-34W
- Step-by-Step Replacement Guide
- Safety Checks and Common Pitfalls
Sources
- Batteryplex on Leoch DJW12-7 replacements
- Eshopmas APC BV650I-GR specs
- Battery Store CSB HR1234WF2 details
- Battery Store CSB UPS12460F2 specs
- TDLider Delta HR 12-34W data
- Redway Power APC UPS battery guide
Conclusion
Swollen batteries like the Leoch DJW12-7 in your APC BV650I-GR are common after 2-3 years, but upgrading to a 9Ah match like CSB HR1234WF2 or Delta HR 12-34W is straightforward and boosts runtime without drama. Prioritize exact specs—voltage, size, terminals, resistance, and discharge—to keep things safe and reliable. Test post-install, and you’ll have peace of mind during outages.
Original Leoch DJW12-7 Specs in APC BV650I-GR
That Leoch DJW12-7? It’s the stock 12V 7Ah sealed lead-acid (SLA/AGM) battery for the APC BV650I-GR, a compact 650VA line-interactive UPS. Why does it swell? Heat cycles, over-discharge, or just age—typically 2-4 years in home/office use. Original specs include F2 faston terminals (0.187-0.250 inch), dimensions around 151x65x94mm (LWH), and weight about 2kg. The official APC part is APCRBCV210, but aftermarket Leoch replacements are plug-and-play if you reuse the cables.
Expect 5-10 minutes of runtime at full load (375W). Swelling means gas buildup inside—time to swap it before it leaks or shorts the UPS circuitry.
Upgrading to 9Ah: Is It Safe?
Absolutely, a 9Ah battery fits and works in the APC BV650I-GR, bumping runtime by 25-30% without overloading the charger. Think bigger gas tank in your car—same engine, longer trip. But here’s the catch: it must match the original’s footprint exactly, or you’ll force the plastic cover. Community tests and Batteryplex guidance confirm 9Ah SLAs like CSB or Delta handle the UPS’s 1-2A charge rate fine, as long as internal resistance stays low (≤0.1Ω) to avoid undercharging.
Higher capacity shines during brownouts, but skip lithium—APC BV650I-GR’s circuitry expects SLA chemistry. Weight? Similar at 2.5kg, no balance issues.
Must-Match Specifications for Compatibility
Not all 12V 9Ah batteries play nice. Nail these specs to ensure the APC BV650I-GR charges properly and delivers power:
| Spec | Requirement | Why It Matters |
|---|---|---|
| Voltage | 12V nominal | Mismatch fries electronics. |
| Capacity | 7-9Ah (20hr rate) | 9Ah OK if other specs align. |
| Dimensions | ≤151x65x100mm (LWH) | Fits compartment; measure yours. |
| Terminals | F2 (6.3mm faston) | Reuse cables—no soldering. |
| Internal Resistance | ≤20-30mΩ (0.02-0.03Ω) | Low for efficient charging; high resists UPS charger. |
| Max Discharge Current | ≥30A continuous, 100A+ burst | Handles startup surges (PC/mods). |
| Chemistry | VRLA/AGM SLA | Gel/LiFePO4 may not vent or signal right. |
From Eshopmas specs, the UPS monitors resistance and current—deviations trigger faults. Also check: cycle life (200+), self-discharge (<3%/month), and temp range (-15°C to 50°C). Datasheets are your bible.
Comparing CSB HR1234WF2, CSB UPS12460F2, and Delta HR 12-34W
These three 12V 9Ah contenders all fit the APC BV650I-GR—same size (151x65x94-100mm), F2 terminals, ~2.5kg. But pick based on your needs:
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CSB HR1234WF2: High-rate king. 34W at 15min, resistance ~18mΩ. Great for short bursts (routers, NAS). Battery Store details show it’s UPS/telecom-tuned—my go-to for reliability.
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CSB UPS12460F2: Power beast. 460W at 5min (!), same low resistance. Overkill for 650VA but future-proofs. Ideal if you overload occasionally. Specs match perfectly per Battery Store.
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Delta HR 12-34W: Budget burst champ. 120A max (5s), resistance <30mΩ, 151x65x100mm. TDLider confirms strong curves for APCs—solid if price matters.
CSB edges for warranty (1-2yrs); Delta for value. All beat stock Leoch on cycles. Test voltage post-install: 13.6-13.8V charging.
Step-by-Step Replacement Guide
Ready to DIY? Takes 15 minutes. Unplug UPS first—duh.
- Power down, wait 5-10 mins for caps to discharge (Redway Power guide).
- Open bottom panel (4 screws). Disconnect red/black wires (negative first).
- Pop out old swollen Leoch—wipe residue.
- Insert new 9Ah (e.g., CSB HR1234WF2), reconnect wires (positive last). Reuse zip ties.
- Close up, plug in, let charge 4-8hrs uninterrupted.
- Test: Force outage via button. Runtime should hit 8-12 mins.
Tools? Phillips screwdriver, gloves. No sparks—use insulated.
Safety Tips
Swollen battery? Treat like a bomb—ventilate, no shorts. Wear gloves/eye pro; dispose at recycle center (lead-acid hazardous). Post-swap, monitor beeps—low charge? Recheck resistance. Hot environment? Fans help longevity.
Overcharge risk with mismatched resistance? Rare but real—UPS cuts off at 14.4V. And runtime claims? Vary by load; test yours. If paranoid, grab APC’s RBC kit, but 9Ah aftermarkets save cash and outperform. Questions? Measure your compartment twice.